Success is the supreme justification of all actions whatsoever. The fact in itself is nothing; the impression that it makes upon others is everything.
 Honoré de Balzac, Lost Illusions (1843). copy citation

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Author Honoré de Balzac
Source Lost Illusions
Topic justification success
Date 1843
Language English
Reference
Note Translated by Ellen Marriage
Weblink https://www.gutenberg.org/cache/epub/13159/pg13159.html

Context

“So in France systems political and moral have started from one point and reached another diametrically opposed; and men have expressed one kind of opinion and acted on another. There has been no consistency in national policy, nor in the conduct of individuals. You cannot be said to have any morality left. Success is the supreme justification of all actions whatsoever. The fact in itself is nothing; the impression that it makes upon others is everything. Hence, please observe a second precept: Present a fair exterior to the world, keep the seamy side of life to yourself, and turn a resplendent countenance upon others. Discretion, the motto of every ambitious man, is the watchword of our Order;” source