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Click on the phrases to see them in context. The original texts by Immanuel Kant and David Hume are available from the Gutenberg Projet.
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Since therefore we ascribe a power of performing an action to every one, who has no very powerful motive to forbear it, and refuse it to such as have; it may justly be concluded, that power has always a reference to its exercise, either actual or probable, and that we consider a person as endowed with any ability when we find from past experience, that it is probable, or at least possible he may exert it. The same holds good also of the postulates of empirical thought in general, which relate to the synthesis of mere intuition (which concerns the form of phenomena), the synthesis of perception (which concerns the matter of phenomena), and the synthesis of experience (which concerns the relation of these perceptions). Nay, more, reason itself cannot cogitate them as according with the general laws of experience. Secondly, We find by experience, that two bodies, which are so placed as to affect the senses in the same manner with two others, that have a certain extent of visible objects interposed betwixt them, are capable of receiving the same extent, without any sensible impulse or penetration, and without any change on that angle, under which they appear to the senses.
The proper term for such a proposition is principle, and not theorem (although it does require to be proved), because it possesses the remarkable peculiarity of being the condition of the possibility of its own ground of proof, that is, experience, and of forming a necessary presupposition in all empirical observation. It is certain, that a considerable part of the beauty of men, as well as of other animals, consists in such a conformation of members, as we find by experience to be attended with strength and agility, and to capacitate the creature for any action or exercise. The uniting principle among our internal perceptions is as unintelligible as that among external objects, and is not known to us any other way than by experience.