For man worked not of necessity, but of his own free-will, by virtue of which man can apply himself, more or less, to action, desire, or knowledge; hence some would have made a greater advance in virtue and knowledge than others.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic action virtue
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17611/pg17611-images.html

Context

“and likewise as regards age; for some would have been born of others; nor would sexual union have been sterile. Moreover, as regards the soul, there would have been inequality as to righteousness and knowledge. For man worked not of necessity, but of his own free-will, by virtue of which man can apply himself, more or less, to action, desire, or knowledge; hence some would have made a greater advance in virtue and knowledge than others. There might also have been bodily disparity. For the human body was not entirely exempt from the laws of nature, so as not to receive from exterior sources more or less advantage and help: since indeed it was dependent on food wherewith to sustain life.” source