In man alone does evil appear as in the greater number; because the good of man as regards the senses is not the good of man as man—that is, in regard to reason; and more men seek good in regard to the senses than good according to reason.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic evil reason
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

“For things which are generated and corrupted, in which alone can there be natural evil, are the smaller part of the whole universe. And again, in every species the defect of nature is in the smaller number. In man alone does evil appear as in the greater number; because the good of man as regards the senses is not the good of man as man—that is, in regard to reason; and more men seek good in regard to the senses than good according to reason. Reply Obj. 6: In the causes of evil we do not proceed to infinity, but reduce all evils to some good cause, whence evil follows accidentally. _______________________ TREATISE ON THE ANGELS (QQ. 50-64)” source