Further, if a man is competent to do a thing by himself, he should not seek the assistance of something weaker and more imperfect.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic seeking
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

“For, as the Philosopher says (De Memoria ii) , when a bodily passion is in movement, it does not rest at once just as one wishes. Therefore a brave man should not employ anger for his action. Obj. 2: Further, if a man is competent to do a thing by himself, he should not seek the assistance of something weaker and more imperfect. Now the reason is competent to achieve by itself deeds of fortitude, wherein anger is impotent: wherefore Seneca says (De Ira i) : "Reason by itself suffices not only to make us prepared for action but also to accomplish it.” source