For when appetite is our master, there is no place for self-control; nor where pleasure reigns supreme can virtue hold its ground.
 Marcus Tullius Cicero, On Friendship (44 BC). copy citation

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Author Marcus Tullius Cicero
Source On Friendship
Topic virtue pleasure
Date 44 BC
Language English
Reference
Note Translated by E. S. Shuckburgh
Weblink http://www.gutenberg.org/files/2808/2808-h/2808-h.htm

Context

“Fornications and adulteries, and every abomination of that kind, are brought about by the enticements of pleasure and by them alone. Intellect is the best gift of nature or God: to this divine gift and endowment there is nothing so inimical as pleasure. For when appetite is our master, there is no place for self-control; nor where pleasure reigns supreme can virtue hold its ground. To see this more vividly, imagine a man excited to the highest conceivable pitch of sensual pleasure. It can be doubtful to no one that such a person, so long as he is under the influence of such excitation of the senses, will be unable to use to any purpose either intellect, reason, or thought.” source