"They learned that reason only perceives that which it produces after its own design; that it must not be content to follow, as it were, in the leading-strings of nature, but must proceed in advance with principles of judgement according to unvarying laws, and compel nature to reply its questions."
Critique of Pure Reason
Text from ebooks@adelaide. Translation by J.M.D. Meiklejohn &lt;<a href="http://ebooks.adelaide.edu.au/k/kant/immanuel/k16p/">Link to ebook</a>&gt;.<br>
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Reading Kant's <u>Critique of Pure Reason</u>, trans. Paul Guyer and Allen Wood (Cambridge: Cambridge UP, 1998). 