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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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For as it was found that mathematical conclusions all proceed according to the principle of contradiction (which the nature of every apodeictic certainty requires), people became persuaded that the fundamental principles of the science also were recognized and admitted in the same way. The principle that everything which happens (the empirically contingent) must have a cause, is a principle of the cognition of nature, but not of speculative cognition. In this view of the case, the whole field of experience, how far soever it may extend, contains nothing that is not subject to the laws of nature. That this proceeds from an original quality or primary impulse, will likewise appear evident, if we consider that it is the distinguishing characteristic of these passions Unless nature had given some original qualities to the mind, it coued never have any secondary ones; because in that case it would have no foundation for action, nor coued ever begin to exert itself. That cause, which excites the passion, is related to the object, which nature has attributed to the passion; the sensation, which the cause separately produces, is related to the sensation of the passion: From this double relation of ideas and impressions, the passion is derived. We shall afterwards take [SECT. 15.] notice of some general rules, by which we ought to regulate our judgment concerning causes and effects; and these rules are formed on the nature of our understanding, and on our experience of its operations in the judgments we form concerning objects. Opinions and probable judgements on the nature of things can only be employed to explain given phenomena, or they may relate to the effect, in accordance with empirical laws, of an actually existing cause. The desire and aversion constitute the very nature of love and hatred.