Hence, although the supreme prin ciples of morality and the fundamental concepts of it are a priori cognitions, they still do not belong in transcendental philosophy,' for, while they do not, to be sure, take the concepts of pleasure and displeasure, of desires and inclinations, etc., which are all of empirical origin, as the ground of their precepts, they still must necessarily include them in the composition of the system of pure morality in the concept of duty, as the hindrance that must be overcome or the attraction that ought not to be made into a motive.