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Determinative judgement subsumes particulars under an already given universal law, whereas reflective judgement must find the universal for an unknown particular. To bridge theoretical knowledge of nature and practical moral freedom, reason presupposes that nature possesses a systematic unity adaptable to human comprehension. This subjective purposiveness of nature allows feeling to link intellect and will.
A judgment of taste rests neither on sensory gratification nor on practical utility, requiring complete disinterestedness from the observer. Beauty pleases universally not because of an objective rule, but through the harmonious free play between imagination and understanding. Because the object exhibits purposiveness without a specific purpose, aesthetic delight feels necessary to every rational mind without depending on logical proof.
While beauty evokes harmony, the sublime arises when nature exceeds the grasp of human senses, producing an initial pain followed by intellectual pleasure. The mathematical sublime confronts boundlessness in size, while the dynamical sublime confronts terrifying physical power like tempests or mountains. In both cases, physical insignificance gives way to the realization that human reason and moral law transcend nature entirely.
Taste appears paradoxical because aesthetic judgments claim universal agreement without relying on logical proof. The conflict pits the claim that taste rests on concepts against the counter-claim that taste cannot rest on concepts at all. Resolution comes by recognizing that taste relies on an indeterminate supersensible concept, which grounds universal human sentiment without providing an objective rule for logical argumentation.
Physical mechanisms explain material interactions, but organic life forces reason to view living beings as natural ends. An organized organism is a whole whose parts are mutually cause and effect of one another's form, functioning as both cause and effect. Mechanics alone cannot account for self-organizing life, requiring reflective judgement to regulate scientific inquiry by assuming internal purpose in biological form.
Apparent contradiction arises when reason asserts that all material things result from mechanical laws while simultaneously claiming organic forms require special teleological causes. This conflict vanishes when both principles are understood not as constitutive descriptions of nature in itself, but as heuristic guidelines for inquiry. Mechanics guides empirical explanation, whereas teleology guides reflective investigation where mechanical knowledge reaches its boundary.
Natural teleology observes purpose within ecosystems but cannot discover an ultimate end for creation within nature alone. Only humanity as a moral agent, acting through autonomous freedom, exists as an unconditioned final purpose. This practical necessity leads reason beyond nature to posture God as the moral author of the world, reuniting aesthetic appreciation, natural science, and practical ethics.
A foundational work connecting pure reason and practical morality through aesthetic feeling and natural purpose.