The intellect can do nothing more than bring out clearly and fully the nature of the motives
 Arthur Schopenhauer, The World as Will and Representation (1819). copy citation

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Author Arthur Schopenhauer
Source The World as Will and Representation
Topic intellect motive
Date 1819
Language English
Reference
Note Translated by R. B. Haldane and J. Kemp
Weblink http://www.gutenberg.org/files/38427/38427-h/38427-h.html

Context

“Certainly the decision enters the sphere of the intellect altogether empirically, as the final conclusion of the matter; but yet it proceeded from the inner nature, the intelligible character, of the individual will in its conflict with given motives, and therefore with complete necessity. The intellect can do nothing more than bring out clearly and fully the nature of the motives; it cannot determine the will itself; for the will is quite inaccessible to it, and, as we have seen, cannot be investigated. If, under the same circumstances, a man could act now one way and now another, it would be necessary that his will itself should have changed in the meantime, and thus that it should lie in time, for change is only possible in time;” source