For Immanuel Kant the most basic phenomenon of moral life, the categorical imperative, is ineluctably bound up with an essential difference between the sensible and the intelligible, across which practical subjectivity is constituted. More specifically, the moral imperative can be experienced only by a finite rational subject whose faculty of desire is divided into lower and higher stems. The lower faculty of desire is determined pathologically, i.e., by the feelings of pleasure and pain, and thus concerns the sensible side of practical subjectivity.1 The higher faculty of desire, on the other hand, is determined exclusively by the pure moral law, and thus concerns the intelligible side of practical subjectivity. For Kant, imperatives are expressed through an ought and thereby indicate the relation of an objective law of reason to a will which in its subjective constitution is not necessarily determined by that law (a necessitation).2 For a being whose will is determined exclusively by the moral law, i.e., without any contribution whatever from sensibility, the element of necessitation or of command that is essential to the experience of the imperative would be entirely out of place. Such a being would act in accordance with the moral law as certainly as natural objects act in accordance with the laws of nature, so that a command to do so would be superfluous. On the other hand, a being whose will is determined exclusively by the feelings of pleasure and pain would be unable even to conceive of the objective law of reason to which it would be commanded to submit itself. In sum, only a being whose practical subjectivity is extended across this essential difference could feel an imperative weighing on its sensibility and experience it as referring beyond its own inclinations to the objective and impersonal moral law. It is enormously important within the context of Kantian moral philosophy to maintain the sharp distinction between the two sides of our practical nature. This is because our acts, in order to acquire that kind of worth that is uniquely moral, must be governed entirely by the intelligibly determined higher faculty of desire, and not at all by the sensibly determined lower faculty. The moral law, for Kant, is characterized most essentially as unconditional and as objective. The lower faculty of desire, which requires as its incentive an object that promises the subject some degree of pleasure, can give rise at best to hypothetical imperatives, which are conditional and subjective. Principles arising from the lower faculty of desire are conditional because they depend on contingent circumstances for their imperative force. I would, for example, feel compelled to get myself a cup of coffee only on the condition that I actually enjoyed coffee, and moreover, that I would enjoy a cup of coffee at that particular moment. Principles of this kind are subjective in that the pleasure that serves as their incentive refers only to particular subjects, and not to the object. That coffee would be pleasurable to me at that moment, for example, is a fact about me, and not about coffee. The kind of compulsion that Kant thinks of as uniquely moral, on the other hand, is experienced as an unconditional command, indifferent or even opposed to our particular inclinations. I respond to the command of the moral imperative not as the particular person I am, with my particular likes and dislikes, but rather as a rational subject, the same as any other. I recognize, for example, that I must not defraud the other party to a financial transaction, even though doing so would be to my advantage. This prohibition has nothing to do with me in particular or with the circumstances of this particular transaction. My being destitute, for example, and the other party's being fabulously wealthy do not affect the moral command in the least. Rather, I recognize in this prohibition an impersonal duty that applies universally and unconditionally. …
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