The principle of desire. The derivative of desire is the derivative of the object of this concept’s beingness or existence as a result of its thoughts. The actuality of the thing, or the efficacy of a concept, together with the subjective state of things in life, are operative derivatives of pleasure (i.e., the function of a derivative in combination with the realization of its creation). For the sake of this criticism of psychological assumptions, I am no longer in need of anything else; the critique itself is sufficient. It is clear that either the derivation of want always depends on pleasure or that pleasure only ever satisfies the need in particular circumstances.This definition leaves this question open-ended since it is based purely on a pure concept, or a class of experience about which no empirical knowledge is available. Although this type of prudence is generally desired in all theories, it is frequently disregarded; for instance,
The Critique of Practical Reason
By – Immanuel Kant