In every human undertaking there is something which is not in our power and does not come within our calculations
 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 power calculation
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

“It is the proof which is founded upon the needy, impotent, and dependent condition of man as opposed to natural forces, which are infinitely superior, inscrutable, and for the most part threatening evil; to which is added man's natural inclination to personify everything, and finally the hope of effecting something by prayers and flattery, and even by gifts. In every human undertaking there is something which is not in our power and does not come within our calculations; the wish to win this for oneself is the origin of the gods. “Primus in orbe Deos fecit timor” is an old and true saying of Petronius. It is principally this proof which is criticised by Hume, who throughout appears as Kant's forerunner in the writings referred to above.” source