Immanuel Kant, with his “brilliantly dry style” (Schopenhauer), expounds the notable theory that “objects are approaching to the mind” via the spectacle metaphor by addressing transcendental idealism in support of the mind as an active knower (mind-making nature), not passive in a realistic sense, while objects of knowledge conform to the mind begotten in categories of understanding. On Kant’s view, James Conant writes, “Kant’s term for this unity, considered at this level of abstraction, is the original synthetic unity of the (...) understanding. This admits of forms of further determination, one sensible and one intellectual. This form of unity – categorial unity – characterizes both the manner in which objects are given to us in intuition and the manner in which concepts are combined in judgments” (Conant 2016: 114). -/- Insofar the same pioneering stance is reflected in the Groundwork of Metaphysics of Morals (Kant 1972) and the Critique of Practical Reason (Kant 1996), where Kant underscores the accessible account of reason and freedom as the content of fundamental moral principle toward a kind of universalizable moral duty attuned with the formulation of categorical imperative. The justification and groundwork of these moral laws cannot be liaison in sensory experience but on pure reason, which Kant calls “a priori,” a conviction stems from the understanding of rational necessitation of moral obligation and free autonomous agency. This interpretation absorbs the practical principle that underlies the subjective maxim to justify the necessary and sufficient conditions for a universal moral law. Kant starts out saying that an act is morally right if it is performed for the sake of broadening the vista of maxim infused by goodwill consisting of the categorical imperative that sounds an exceptionless command, abstract law, and universally applicable normative principle as well. For Kant, the categorical imperative has many-sided structures: a. Ethical requirements are rational requirements of the moral agent. b. The rational requirement goes toward universal laws. c. These moral requirements must be followed by equality, freedom, and goodwill. (shrink)