Abstract

This paper shows how, according to st. thomas aquinas, basic descriptive moral principles can be both substantive and necessarily true. aquinas's position on reference (the function of the subject term) is similar to that of the contemporary logician, saul kripke, who argues for necessary informative propositions. such propositions in aquinas (which are analyzed in detail in the paper) include definitions-e.g., "human beings, or men, are rational animals"-and property statements. the latter encompass those concerned with natural inclinations. from this foundation the necessity of fundamental moral principles is explained. still, moral principles can be refined as we discover more about human nature; "if" true, such statements will be necessarily true. the paper ends with an explanation of how basic moral principles can be considered to be not simply "per se", but also "per se nota"