No brute is capable of a purpose properly so-called. To conceive and follow out a purpose is the prerogative of man, and it is a prerogative which is rich in consequences.
 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 consequences purpose
Date 1819
Language English
Reference
Note Translated by R. B. Haldane and J. Kemp
Weblink http://www.gutenberg.org/files/40097/40097-h/40097-h.html

Context

“Hence human conduct has throughout the stamp of intention or deliberate purpose, the absence of which, and the consequent determination by the impulse of the moment, is the fundamental characteristic of all the action of the brutes. No brute is capable of a purpose properly so-called. To conceive and follow out a purpose is the prerogative of man, and it is a prerogative which is rich in consequences. Certainly an instinct like that of the bird of passage or the [pg 232] bee, still more a permanent, persistent desire, a longing like that of the dog for its absent master, may present the appearance of a purpose, with which, however, it must not be confounded.” source