relative to experience. Thus a problematic judgment, i.e., one in which ‘affirmation or negation is taken as merely possible,’ is used when something is said to be possible in the sense that it ‘agrees with the formal conditions of experience, i.e., with the conditions of intuition and of concepts.’ A clue for rescuing the relational categories is given near the end of the Transcendental Deduction (B version), where Kant notes that the a priori all-inclusiveness and unity of space and time that is claimed in the treatment of sensibility must, like all cognitive unity, ultimately have a foundation in judgment. Kant expands on this point by devoting a key section called the analogies of experience to arguing that the possibility of our judging objects to be determined in an objective position in the unity of time (and, indirectly, space) requires three a priori principles (each called an ‘Analogy’) that employ precisely the relational categories that seemed especially questionable. Since these categories are established as needed just for the determination of time and space, which themselves have already been argued to be transcendentally ideal, Kant can conclude that for us even a priori claims using pure concepts of the understanding provide what are only transcendentally ideal claims. Thus we cannot make determinate theoretical claims about categories such as substance, cause, and community in an absolute sense that goes beyond our experience, but we can establish principles for their spatiotemporal specifications, called schemata, namely, the three Analogies: ‘in all change of appearance substance is permanent,’ ‘all alterations take place in conformity with the law of the connection of cause and effect,’ and ‘all substances, insofar as they can be perceived to coexist in space, are in thoroughgoing reciprocity.’ Kant initially calls these regulative principles of experience, since they are required for organizing all objects of our empirical knowledge within a unity, and, unlike the constitutive principles for the categories of quantity and quality (namely: ‘all intuitions [for us] are extensive magnitudes,’ and ‘in all appearances the real that is an object of sensation has intensive magnitude, that is, a degree’), they do not characterize any individual item by itself but rather only by its real relation to other objects of experience. Nonetheless, in comparison to mere heuristic or methodological principles (e.g., seek simple or teleological explanations), these Analogies are held by Kant to be objectively necessary for experience, and for this reason can also be called constitutive in a broader sense.
The remainder of the Critique exposes the ‘original’ or ‘transcendental’ ideas of pure reason that pretend to be constitutive or theoretically warranted but involve unconditional components that wholly transcend the realm of experience. These include not just the antinomic cosmological ideas noted above (of these Kant stresses the idea of transcendental freedom, i.e., of uncaused causing), but also the rational psychological ideas of the soul as an immortal substance and the rational theological idea of God as a necessary and perfect being. Just as the pure concepts of the understanding have an origin in the necessary forms of judgments, these ideas are said to originate in the various syllogistic forms of reason: the idea of a soul-substance is the correlate of an unconditioned first term of a categorical syllogism (i.e., a subject that can never be the predicate of something else), and the idea of God is the correlate of the complete sum of possible predicates that underlies the unconditioned first term of the disjunctive syllogism used to give a complete determination of a thing’s properties. Despite the a priori origin of these notions, Kant claims we cannot theoretically establish their validity, even though they do have regulative value in organizing our notion of a human or divine spiritual substance. Thus, even if, as Kant argues, traditional proofs of immortality, and the teleological, cosmological, and ontological arguments for God’s existence, are invalid, the notions they involve can be affirmed as long as there is, as he believes, a sufficient non-theoretical, i.e., moral argument for them. When interpreted on the basis of such an argument, they are transformed into ideas of practical reason, ideas that, like perfect virtue, may not be verified or realized in sensible experience, but have a rational warrant in pure practical considerations. Although Kant’s pure practical philosophy culminates in religious hope, it is primarily a doctrine of obligation. Moral value is determined ultimately by the nature of the intention of the agent, which in turn is determined by the nature of what Kant calls the general maxim or subjective principle underlying a person’s action. One follows a hypothetical imperative when one’s maxim does not presume an unconditional end, a goal (like the fulfillment of duty) that one should have irrespective of all sensible desires, but rather a ‘material end’ dependent on contingent inclinations (e.g., the directive ‘get this food,’ in order to feel happy). In contrast, a categorical imperative is a directive saying what ought to be done from the perspective of pure reason alone; it is categorical because what this perspective commands is not contingent on sensible circumstances and it always carries overriding value. The general formula of the categorical imperative is to act only according to those maxims that can be consistently willed as a universal law – something said to be impossible for maxims aimed merely at material ends. In accepting this imperative, we are doubly self-determined, for we are not only determining our action freely, as Kant believes humans do in all exercises of the faculty of choice; we are also accepting a principle whose content is determined by that which is absolutely essential to us as agents, namely our pure practical reason. We thus are following our own law and so have autonomy when we accept the categorical imperative; otherwise we fall into heteronomy, or the (free) acceptance of principles whose content is determined independently of the essential nature of our own ultimate being, which is rational. Given the metaphysics of his transcendental idealism, Kant can say that the categorical imperative reveals a supersensible power of freedom in us such that we must regard ourselves as part of an intelligible world, i.e., a domain determined ultimately not by natural laws but rather by laws of reason. As such a rational being, an agent is an end in itself, i.e., something whose value is not dependent on external material ends, which are contingent and valued only as means to the end of happiness – which is itself only a conditional value (since the satisfaction of an evil will would be improper). Kant regards accepting the categorical imperative as tantamount to respecting rational nature as an end in itself, and to willing as if we were legislating a kingdom of ends. This is to will that the world become a ‘systematic union of different rational beings through common laws,’ i.e., laws that respect and fulfill the freedom of all rational beings. Although there is only one fundamental principle of morality, there are still different types of specific duties. One basic distinction is between strict duty and imperfect duty. Duties of justice, of respecting in action the rights of others, or the duty not to violate the dignity of persons as rational agents, are strict because they allow no exception for one’s inclination. A perfect duty is one that requires a specific action (e.g. keeping a promise), whereas an imperfect duty, such as the duty to perfect oneself or to help others, cannot be completely discharged or demanded by right by someone else, and so one has considerable latitude in deciding when and how it is to be respected. A meritorious duty involves going beyond what is strictly demanded and thereby generating an obligation in others, as when one is extraordinarily helpful to others and ‘merits’ their gratitude.
See also EPISTEMOLOGY , ETHICS, IDEALISM, METAPHYSICS , RATIONALISM , TRANSCENDEN — TAL ARGUMEN. K.A.