If a man is always disposed to do wrong whenever the opportunity presents itself, and there is no external power to restrain him, we call him bad.
 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 opportunity
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

“absolute good, the summum bonum—and regard it as the only radical cure of the disease of which all other means are only palliations or anodynes. In this sense the Greek τελος and also finis bonorum correspond to the thing still better. So much for the words good and bad; now for the thing itself. If a man is always disposed to do wrong whenever the opportunity presents itself, and there is no external power to restrain him, we call him bad. According to our doctrine of wrong, this means that such a man does not merely assert the will to live as it appears in his own body, but in this assertion goes so far that he denies the will which appears in other individuals.” source