I answer that, The essence of human virtue consists in safeguarding the good of reason in human affairs, for this is man's proper good.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic virtue reason
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/18755/pg18755-images.html

Context

“15:18) : "Nicanor hearing of the valor of Judas' companions, and the greatness of courage (animi magnitudinem) with which they fought for their country, was afraid to try the matter by the sword." Now, only deeds of virtue are worthy of praise. Therefore magnanimity which consists in greatness of courage is a virtue.
I answer that, The essence of human virtue consists in safeguarding the good of reason in human affairs, for this is man's proper good. Now among external human things honors take precedence of all others, as stated above (A. 1; I-II, Q. 11, A. 2, Obj. 3). Therefore magnanimity, which observes the mode of reason in great honors, is a virtue.
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