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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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The philosophy of nature relates to that which is, that of ethics to that which ought to be.

 As, during these labours, I have advanced pretty far in years this month I reach my sixty-fourth year--it will be necessary for me to economize time, if I am to carry out my plan of elaborating the metaphysics of nature as well as of morals, in confirmation of the correctness of the principles established in this Critique of Pure Reason, both speculative and practical; and I must, therefore, leave the task of clearing up the obscurities of the present work--inevitable, perhaps, at the outset--as well as, the defence of the whole, to those deserving men, who have made my system their own. In other words, we must restrict the sphere of opinion to the world of experience and nature. In order to discover these necessities and interests, we must consider the same qualities of human nature, which we have already found to give rise to the preceding laws of society. This is noted in the case of liars; who by the frequent repetition of their lies, come at last to believe and remember them, as realities; custom and habit having in this case, as in many others, the same influence on the mind as nature, and infixing the idea with equal force and vigour.