Click on the phrases to see them in context. The original texts by Immanuel Kant and David Hume are available from the Gutenberg Projet..But because a proof of this nature cannot be dogmatical, that is, cannot be drawn from conceptions, inasmuch as it concerns a synthetical proposition a priori, and as philosophers never reflected that such propositions are valid only in relation to possible experience, and therefore cannot be proved except by means of a deduction of the possibility of experience, it is no wonder that while it has served as the foundation of all experience (for we feel the need of it in empirical cognition), it has never been supported by proof. It is only in time that it is possible to meet with two contradictorily opposed determinations in one thing, that is, after each other. This interest I find to consist in the security and protection, which we enjoy in political society, and which we can never attain, when perfectly free and independent. The sensation of humility is uneasy, as that of pride is agreeable; for which reason the separate sensation, arising from the causes, must be reversed, while the relation to self continues the same. That is to say, a certain degree of change does not originate from the addition of many simple changes. This is therefore the condition of the possibility of things themselves as objects of experience. This is to reverse the order of nature, and make that secondary, which is really primary, To every operation there is a power proportioned; and this power must be placed on the body, that operates.