A complete system of classical Aristotelian logic intended for honors high school and college.

Symbolic logic may be superior to classical Aristotelian logic for the sciences, but not for the humanities. This text is designed for do-it-yourselfers as well as classrooms.

The purpose of this valuable book is to consider recent cultural trends in bioethics from a Catholic perspective. Bioethics is intended for a lay audience interested in understanding bioethical issues from a Catholic perspective.

This new and revised edition of Peter Kreeft's Socratic Logic is updated, adding new exercises and more complete examples, all with Kreeft's characteristic clarity and wit. Since its introduction in the spring of 2004, Socratic Logic has proven to be a different type of logic text: This is the only complete system of classical Aristotelian logic in print. The "old logic" is still the natural logic of the four language arts. Symbolic, or "mathematical," logic is not for the humanities. This (...) book is simple and user-friendly. It is highly interactive, with a plethora of exercises and a light, engaging style. It is practical. It is designed for do-it-yourselfers as well as classrooms. It emphasizes topics in proportion to probable student use: e.g., interpreting ordinary language, not only analyzing but also constructing effective arguments, smoking out hidden assumptions, making "argument maps," and using Socratic method in various circumstances. It is philosophical. Its exercises expose students to many classical quotations, and additional chapters introduce philosophical issues in a Socratic manner and from a commonsense, realistic point of view. It prepares students for reading Great Books rather than Dick and Jane, and models Socrates as the beginner's ideal teacher and philosopher. (shrink)

This book is designed for three classes of people: Beginners who want an introduction to philosophy; Those who have already had an introduction to philosophy and who would like to see it in action now applied to a great book written by a great philosophy, but who have never read Plato's Republic, the most famous and influential philosophy book ever written; Those who have read Plato's Republic before but did not understand its deepest significance. Why is Plato the best introduction (...) to philosophy? Peter Kreeft has taught philosophy for over 50 years, including one section of a course for beginners every semester. He has tried just about everything possible, and a few new things that are impossible. He has experimented with every one of the many alternative methods available for teaching beginners. (He has A.D.D., so he easily gets bored and likes to try new things all the time.) But he has never found anything nearly as successful as Plato. Plato is the best writer in the history of philosophy. Most philosophers are dull, undramatic, abstract writers. (There are a few other exceptions besides Plato: Augustine, Pascal, Nietzsche, Kierkegaard.) But Plato wrote dramatic dialogues, in which Socrates, his famous teacher, interacts with a great variety of fools. These dialogues are like intellectual swordfights, and even though you know Socrates is going to win, they are exciting because you see his ideas come alive, like a sword in the handoff a master. Plato is a great dramatist, a great poet, and a great psychologist as well as a great philosopher. Nobody else who ever lived combined those four talents as well as Plato did. Apprenticeship to a great master is the best way to learn any art. The student will understand what philosophy is better by watching a master do it than by reading abstract definitions of it from a second-rate philosopher, or by a mere scholar. Concrete examples are always the easiest way to learn things. Plato's dialogues are the world's first, and still the best, concrete example of philosophizing. Kreeft introduces his students to this love affair through a great matchmaker, Plato, who is a better teacher than the student will ever meet in the land of the living. In fact, Plato still is in the land of the living. He's still alive and kicking in his dialogues. He rubs off on those who are wise and humble enough to become a student. (shrink)

One universal anonymous sage : the Rta/Tao/Logos -- Four sages from the East. The Hindu tradition : the four wants of man -- Buddha : Nirvana -- Confucius : social harmony -- Lao Tzu : nature's way -- Three sages from the West. Moses : divine law -- Jesus : agape love -- Muhammad : "Islam" -- Three classic Greek founders of philosophy. Socrates : the primacy of wisdom ("Virtue is knowledge") -- Plato: No double standard : ethics and politics (...) ; Platonic Ideas : the objective reality of goodness ; Justice as health of soul and therefore always profitable -- Aristotle: Happiness as the end, the greatest good ; Virtue as the road to happiness ; The good as teleological ; The golden mean as the key to virtue ; Ethics as dependent on metaphysics ; The (later) idea of "natural law" -- Three lesser but more popular ancient philosophers. Protagoras -- Epicurus: Hedonism -- Epicurus: Stoicism -- Three medieval Christian saints. St. Augustine: Love as gravity ; Only two kinds of people ; The restless heart -- St. Anselm : the good greater than which nothing can be thought -- Thomas Aquinas: The role of faith and reason ; Four kinds of law ; The four cardinal virtues and the three theological virtues ; Eight candidates for happiness -- Three modern political philosophers. Machiavelli : the good as the practical -- Hobbes : the good as power -- Rousseau : the good as feeling -- Three classic modern ethical alternatives. Hume : the good as subjective -- Kant: The good as goodwill ; Goodwill as duty ; Duty as the "categorical imperative" -- Mill : utilitarianism : the good as maximally happy consequences -- Three Existentialists. Kierkegaard : aesthetics, ethics, and religion -- Nietzsche: The genealogy of morals as resentment ; The Superman : "beyond good and evil" ; "The will to power" -- Sartre: God vs. freedom ; Love vs. freedom -- Two Personalists. Marcel: Being as value ; Mysteries vs. problems ; "Creative fidelity" -- Von Hildebrand: Three kinds of value ; The ethics of the heart -- Three analytic philosophers. Ayer : the good as meaningless -- Moore : the good as indefinable -- Wittgenstein : the good as "mystical" -- Is ethics dead? MacIntyre "After Virtue" vs. Aquinas. (shrink)

"Juxtaposing "ecumenism" and "jihad," two words that many would consider strange and at odds with one another, Peter Kreeft argues that we need to change our current categories and alignments. We need to realize that we are at war and that the sides havechanged radically. Docu-menting the spiritual and moral decay that has taken hold of modern society, Kreeft issues a wake-up call to all God-fearing Christians, Jews, and Muslims to unite together in a "religious war" against the common enemy (...) of godless secular humanism, materialism, and immorality. "Be forewarned. This book pricks prejudices, jostles assumptions, and can do permanent harm to complacent Christianity. Definitely not recommended for people who are unprepared for a rollickingly adventurous journey into truths that might change them forever. Don't say you were not warned." - Fr. Richard John Neuhaus"--. (shrink)

'"This book almost didn't exist. I was about to write a serious, heavy book entitled How To Save Western Civilization, as a sequel to my book How To Destroy Western Civilization and Other Ideas from the Cultural Abyss. But writing it was not making me happy, and reading it was not going to make anybody else happy either. And then I stopped just long enough for my guardian angel to squeeze through that tiny window of opportunity that I had opened (...) up by my silence and to whisper this commonsense question into my subconscious: "Why not make them happy instead?" I started thinking: Western civilization is neither healthy, happy, nor holy. Humor is all three. Humor is not only holy, it's Heavenly. And if you are surprised to be told that humor is Heavenly, you need to read this book because you reveal your misunderstanding of both humor and Heaven. If you ask, 'Is there laughter in Heaven?' my answer is: 'You can't be serious!'"-- Back cover. (shrink)

Best-selling author Peter Kreeft presents a series of brilliant essays about many of the issues that increasingly divide our Western civilization and culture. He states that these essays are not new proposals or solutions to today's problems. They are old. They have been tried, and have worked. They have made people happy and good. That is what makes them so radical and so unusual today. The most uncommon thing today is common sense. Kreeft presents relevant, philosophical data that can guide (...) us, divided into 7 categories: epistemological, theological, metaphysical, anthropological, ethical, political, and historical. He then explores these categories with classic Kreeft insights, presenting 40 pithy points on how we can implement the data from these categories to help save civilization;and more importantly, save souls. (shrink)

Preface: What this strange book is about -- Conversation 1: where's the formula? -- Conversation 2: brain and mind -- Conversation 3: logic and intuition -- Conversation 4: how to open the 'third eye' -- Conversation 5: matter and spirit -- Conversation 6: the data -- Conversation 7: synchronicity -- Conversation 8: waves -- Conversation 9: holism -- Conversation 10: the music of the spheres -- Conversation 11: cultural consequences -- Conversation 12: water magic.

This is the first book about surfing ever written by a philosopher. The author, a 70-year-old surfanatic, has been Professor of Philosophy at Boston College for over 40 years and has written 50 other books on philosophy, religion, and culture. But compared to this one, the others are nothing but straw. It gives ten compelling existential. reasons why everyone should surf: reasons from the great philosophers: Moses, Buddha, Confucius, Lao Tzu, Socrates, Plato, Aristotle, Jesus, Machiavelli, Freud, and George Morey. It (...) explains how surfing is the easiest and most delightful way in the world to attain what you most deeply long for, for it can make you good, mystical, peaceful, wise, heavenly, happy, sexy, and even rich. (shrink)

"Jesus Shock is the second in a series of short works on seminal concerns of the impact that Jesus Christ made in the world. The first work, The Philosophy of Jesus, explored philosophy in light of Jesus, rather than the other way around. The present work investigates the reception Jesus received both in His lifetime and continuously to the present time, not only from His enemies, but from His friends, a reception of shock, astonishment, even disgust." "Jesus-Shock shows the reasons (...) why to this day the name of "Jesus" stirs up controversy, even revulsion, in polite society. In the true spirit of ecumenism, it also points the way toward a true rapprochement among His modern-day disciples."--BOOK JACKET. (shrink)

"The popular author and philosophy professor Peter Kreeft presents this introduction to philosophy to help beginners not only to understand philosophy but also to fall in love with it. In his forty years of teaching philosophy, Kreeft says that the most effective way to accomplish this purpose is to read Socrates." -- Back cover.

Just what is philosophy? Is there objective truth? Is self-knowledge possible? What is being? What is man's relation to nature? Is it possible for human reason to know God? If there is a God, why is there evil? What is happiness and how can we achieve it? If you've ever wondered about the answers to any of these questions, this is the book for you!...Every Catholic should own one book on philosophy. This is it." [taken from back cover].

"How is this history of philosophy different from all others? 1. It's neighter very long nor very short just long enough. 2. It's available in separate volumes but eventually in one complete work. 3. It focuses on the "big ideas" that have influenced present people and present times. 4. It includes relevant biographical data, proportionate to its importance for each thinker. 5. It is not just history but philosophy. Its aim is not merely to record facts but to stimulate philosophizing, (...) controversy, argument. 6. It aims above all at understanding, at what the old logic called the "first act of the mind" rather than the third: the thing computers and many "analytic philosophers" cannot understand. 7. It uses ordinary language and logic, not academic jargon or symbolic logic. 8. It is commonsensical. 9. It is "existential" in that it sees philosophy as something to be lived and tested"--. (shrink)

"How is this history of philosophy different from all others? 1. It's neighter very long nor very short just long enough. 2. It's available in separate volumes but eventually in one complete work. 3. It focuses on the "big ideas" that have influenced present people and present times. 4. It includes relevant biographical data, proportionate to its importance for each thinker. 5. It is not just history but philosophy. Its aim is not merely to record facts but to stimulate philosophizing, (...) controversy, argument. 6. It aims above all at understanding, at what the old logic called the "first act of the mind" rather than the third: the thing computers and many "analytic philosophers" cannot understand. 7. It uses ordinary language and logic, not academic jargon or symbolic logic. 8. It is commonsensical. 9. It is "existential" in that it sees philosophy as something to be lived and tested"--. (shrink)

"How is this history of philosophy different from all others? 1. It's neighter very long nor very short just long enough. 2. It's available in separate volumes but eventually in one complete work. 3. It focuses on the "big ideas" that have influenced present people and present times. 4. It includes relevant biographical data, proportionate to its importance for each thinker. 5. It is not just history but philosophy. Its aim is not merely to record facts but to stimulate philosophizing, (...) controversy, argument. 6. It aims above all at understanding, at what the old logic called the "first act of the mind" rather than the third: the thing computers and many "analytic philosophers" cannot understand. 7. It uses ordinary language and logic, not academic jargon or symbolic logic. 8. It is commonsensical. 9. It is "existential" in that it sees philosophy as something to be lived and tested"--. (shrink)

"How is this history of philosophy different from all others? 1. It's neighter very long nor very short just long enough. 2. It's available in separate volumes but eventually in one complete work. 3. It focuses on the "big ideas" that have influenced present people and present times. 4. It includes relevant biographical data, proportionate to its importance for each thinker. 5. It is not just history but philosophy. Its aim is not merely to record facts but to stimulate philosophizing, (...) controversy, argument. 6. It aims above all at understanding, at what the old logic called the "first act of the mind" rather than the third: the thing computers and many "analytic philosophers" cannot understand. 7. It uses ordinary language and logic, not academic jargon or symbolic logic. 8. It is commonsensical. 9. It is "existential" in that it sees philosophy as something to be lived and tested"--. (shrink)

What good is logic? -- Seventeen ways this book is different -- The two logics -- All of logic in two pages : an overview -- The three acts of the mind -- I. The first act of the mind : understanding -- Understanding : the thing that distinguishes man from both beast and computer -- Concepts, terms and words -- The problem of universals -- The comprehension and extension of terms -- II. Terms -- Classifying terms -- Categories -- (...) Predicables -- Division -- III. Material fallacies -- Fallacies of language -- Fallacies of diversion -- Fallacies of oversimplification -- Fallacies of argumentation -- Inductive fallacies -- Procedural fallacies -- Metaphysical fallacies -- Short story : love is a fallacy -- IV. Definition -- The nature of definition -- The rules of definition -- The kinds of definition -- The limits of definition -- V. Second act of the mind : judgment -- Judgments, propositions, and sentences -- What is truth? -- The four kinds of categorical propositions -- Logical form -- Euler's circles -- Tricky propositions -- The distribution of terms -- VI. Changing propositions -- Immediate inference -- Conversion -- Obversion -- Contraposition -- VII. Contradiction -- What is contradiction? -- The square of opposition -- Existential import -- Tricky propositions on the square -- Some practical uses of the square of opposition -- VIII. The third act of the mind : reasoning -- What does reason mean? -- The ultimate foundations of the syllogism -- How to detect arguments -- Arguments vs. explanations -- Truth and validity -- IX. Different kinds of arguments -- Three meanings of because -- The four causes -- A classification of arguments -- Simple argument maps -- Deductive and inductive arguments -- Combining deduction and induction : socratic method -- X. Syllogisms -- The structure and strategy of the syllogism -- The skeptics objection to the syllogism -- The empiricist's objection to the syllogism -- Demonstrative syllogisms -- How to construct convincing syllogisms -- XI. Checking syllogisms for validity -- By Euler's circles -- By Aristotle's six rules -- Barbara Celarent : mood and figure -- Venn diagrams -- XII. More difficult syllogisms -- Enthymemes : abbreviated syllogisms -- Sorites : chain syllogisms -- Epicheiremas : multiple syllogisms -- Complex argument maps -- XIII. Compound syllogisms -- Hypothetical syllogisms -- Reductio ad absurdum arguments -- The practical syllogism : arguing about means and ends -- Disjunctive syllogisms -- Conjunctive syllogisms -- Dilemmas -- XIV. Induction -- What is induction? -- Generalization -- Causal induction : Mill's methods -- Scientific hypotheses -- Statistical probability -- Arguments from analogy -- A fortiori and a minore arguments -- XV. Some practical applications of logic -- How to write a logical essay -- How to write a socratic dialogue -- How to have a socratic debate -- How to use socratic method on difficult people -- How to read a book socratically -- XVI. Some philosophical applications of logic -- Logic and theology -- Logic and metaphysics -- Logic and cosmology -- Logic and philosophical anthropology -- Logic and epistemology -- Logic and ethics. (shrink)

This new and revised edition of Peter Kreeft's Socratic Logic is updated, adding new exercises and more complete examples, all with Kreeft's characteristic clarity and wit. Since its introduction in the spring of 2004, Socratic Logic has proven to be a different type of logic text: This is the only complete system of classical Aristotelian logic in print. The "old logic" is still the natural logic of the four language arts. Symbolic, or "mathematical," logic is not for the humanities. This (...) book is simple and user-friendly. It is highly interactive, with a plethora of exercises and a light, engaging style. It is practical. It is designed for do-it-yourselfers as well as classrooms. It emphasizes topics in proportion to probable student use: e.g., interpreting ordinary language, not only analyzing but also constructing effective arguments, smoking out hidden assumptions, making "argument maps," and using Socratic method in various circumstances. It is philosophical. Its exercises expose students to many classical quotations, and additional chapters introduce philosophical issues in a Socratic manner and from a commonsense, realistic point of view. It prepares students for reading Great Books rather than Dick and Jane, and models Socrates as the beginner's ideal teacher and philosopher. (shrink)

Symbolic logic may be superior to classical Aristotelian logic for the sciences, but not for the humanities. This text is designed for do-it-yourselfers as well as classrooms.

This is the 5th volume in the series of popular, small volumes by the well-known philosophy Professor Kreeft in which the "Father of Philosophy," Socrates, cross-examines various other important philosophers and thinkers In this work, he states that Socrates and Descartes are probably the two most important philosophers who have ever lived, because they are the two who made the most difference to all philosophy after them. The two of them stand at the beginning of the two basic philosophical options: (...) the classical and the modern. Kreeft focuses on seven features that unite these two major philosophers and distinguish them from all others. So this dialog between Socrates and Descartes is a dialog between the fundamental stages in the history of philosophy, the history of consciousness, and the history of Western culture. (shrink)

Probably no single thinker since Jesus has influenced the thoughts and lives of more people living in the Western world today than Sigmund Freud. Even agnostics like William Barrett, in Irrational Man, and atheists like Nietzsche, agree that the single most radical change in the last thousand years of Western civilization has been the decline of religion. And the four most influential critics of religion have certainly been Nietzsche, Marx, Darwin, and Freud. Of the four, Freud is by far the (...) most popular No name is more associated with, and in fact responsible for, "the sexual revolution" than Freud. And no revolution in history, at least none since the one around a cross and an empty tomb, and perhaps even none since the one around a snake and an apple, has been more life-changing, and has more potential to continue to be more radically life-changing in the future, than the sexual revolution. To see this, just read Huxley's Brave New World. (And remember that Huxley was far from being a theist.) Freud wore three hats. Freud was (1) a practicing psychoanalyst (indeed, the inventor of psychoanalysis), (2) a professional theoretical psychologist and sociologist, and (3) an amateur philosopher. This book explores only his philosophy, for that is the point of his intersection with Socrates. If Socrates is right in his deepest convictions about the power of reason and the importance of philosophy, Freud's philosophy is the ultimate source, foundation, explanation, and justification for his psychology. (shrink)

This book is the 6th book in a series of Socratic explorations of some of the Great Books. The books in this series are intended to be short, clear, and non-technical, thus fully understandable by beginners. Through such Socratic dialogues, Peter Kreeft introduces the basic questions in the fundamental divisions of philosophy: metaphysics, epistemology, anthropology, ethics, logic, and method. In Socrates Meets Hume, Kreeft presents a Socratic examination of enquiry concerning human understanding in relation to the skepticism of Hume, posing (...) questions that challenge the concepts that Hume proposed. Kreeft states that Hume is the "most formidable, serious, difficult-to-refute skeptic in the history of human thought." Kreeft invites you to take part in the process of refuting Hume's skeptical arguments, with the aid of Socrates. Based on an imaginary dialogue between Socrates and Hume that takes place in the afterlife, this profound and witty book makes an entertaining and informative exploration of modern philosophy. (shrink)

No philosopher since Augustine had more strings to his bow than SK.

Immanuel Kant is one of the greatest philosophers in history. But, as Peter Kreeft notes in this book, Kant is really two philosophers-a philosopher about how we know things and a philosopher of right and wrong. If he had written only on either topic, he would still be the most important and influential of the modern philosophers.

What if we could overhear a conversation in the afterlife between Socrates and Machiavelli, in which Machiavelli has to submit to an Oxford tutorial style examination of his book conducted by Socrates using his famous method of cross-examination? How might the conversation go? This imaginative thought-experiment makes for both imaginative drama and a good lesson in logic, in moral and political philosophy, in "how to read a book," and in the history of early modern thought.

Humorous, frank, and insightful, this book challenges the reader to step in and take hold of what is right and to cast away what is wrong. Topics covered included such varied subjects as private property, the individual, the Three Philosophies of Man, women, individualism, and more. A wonderful introduction to philosophy for the neophyte, and a joy for the experienced student of thought. "Imagine two of the most influential thinkers of all time, and two of the most diametrically opposed, thrust (...) together in a no holds barred debate about some of the most important questions: Does man move the world or is he only a puppet of forces beyond his control? Is there a human nature or only market forces? Is Communism the liberator of mankind or a deadly scourge? In Peter Kreeft's Socrates Meets Marx, the father of philosophy cross examines the founder of communism using the Communist Manifesto, details from the life of Marx himself, and the witnesses of history as evidence to be considered for judgment. If only every edition of the Communist Manifesto would have been bound together with a copy of this book, the world would be a much saner place." - Christopher Kaczor, author of Proportionalism and the Natural Law Tradition. (shrink)

Kreeft takes the reader through the world of existentialist philosophy, posing questions that challenge the concepts that Sartre proposed. Based on an imagination dialogue between Socrates and Sartre that takes place in the afterlife, this profound and witty book makes an entertaining and informative exploration of modern philosophy "Peter Kreeft's work is (1) unfailingly brilliant, (2) intellectually agile, (3) astonishingly perspicacious, (4) gloriously orthodox, (5) Chestertonian aphoristic." - Thomas Howard, author of On Being Catholic.

Introduction I : Who is this book for? -- Introduction II : How is Jesus a philosopher? -- Introduction III : What are the four great questions of philosophy? -- Jesus' metaphysics (What is real?). Jesus' Jewish metaphysics ; Jesus' new name for God ; The metaphysics of love ; The moral consequences of metaphysics ; Sanctity as the key to ontology ; The metaphysics of "I am" -- Jesus' epistemology (How do we know what is real?) -- Jesus' anthropology (...) (Who are we who know what is real?) -- Jesus' ethics (What should we be to be more real?). Christian personalism : seeing "Jesus only" ; The overcoming of legalism ; The refutation of relativism ; The secret of moral success ; Jesus and sex ; Jesus and social ethics : solidarity ; Jesus and politics : is he left or right? -- Conclusion. (shrink)

The Platonic tradition in Western philosophy is not just one of many equally central traditions. It is so much THE central one that the very existence and survival of Western civilization depends on it. It is like the Confucian tradition in Chinese culture, or the monotheistic tradition in religion, or the human rights tradition in politics. In the first of his eight lectures, Peter Kreeft defines Platonism and its "Big Idea," the idea of a transcendent reality that the history of (...) philosophy has labeled "Platonic Ideas" or Platonic Forms. In the second lecture, he briefly explores Plato's two basic predecessors or sources, myth and Socrates; and then looks at 12 applications of the Forms in Plato's own dialogues. The third lecture covers the three most important modifications or additions to Plato himself in the Platonic tradition: Aristotle, Plotinus, and Augustine, each of whom gave the Forms a new metaphysical address. The fourth lecture explores six Christian Platonists, three in the New Testament and three philosophers, Justin Martyr, Bonaventure, and Aquinas. The next three lectures explore the consequences of the modern abandoning of Platonism, beginning with William of Ockham's Nominalism, as the source of nearly all modern philosophical errors, and its results in the Empiricism of Locke and Hume, the so-called Copernican Revolution in philosophy in Kant, the so-called "analytic philosophy," which still dominates English and American philosophy departments. In the sixth essays, Kreeft looks at 13 influential kinds of positivism or reductionism in modern thought: in method, history, metaphysics, epistemology, ethics, sociology, politics, logics, linguistics, sex, psychology, and theology, exemplified by Descartes, Machiavelli, Hobbes, Marx, Kant, Comte, Rousseau, Rawls, Ayer, Derrida, Freud, Skimmer, Nietzsche, and Sartre. Lecture 7 looks at the results of abandoning the Platonic tradition in ethics, the values vacuum, or nihilism, in Ecclesiastes, Pascal, Kierkegaard, Nietzsche, Heidegger, Sartre, Dostoyevsky, Tolstoi, Marcel, and Buber. In the last lecture, Kreeft looks at some experiential evidence for Platonism, doors out of the cave that are still open, signals of transcendence. (shrink)

The quest -- Data -- Magic -- The sea as beloved -- Childhood -- Infinity -- Beaches -- The history of sea love -- The sea as koan -- Orenda -- The joy of ignorance -- Water -- Seeing the sea with the third eye -- The sea as miracle -- Music -- Water in love -- Aliveness -- The dark side -- The sea as toy -- The sea as healer -- Time and power.