Obj. 2: Further, every part of a moral virtue is about certain passions which that virtue moderates. Now perseverance does not imply moderation of the passions: since the more violent the passions, the more praiseworthy is it to persevere in accordance with reason.
 Thomas Aquinas, Summa Theologica (1274). copy citation

add
Author Thomas Aquinas
Source Summa Theologica
Topic perseverance moderation
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

“Objection 1: It seems that perseverance is not a part of fortitude. For, according to the Philosopher (Ethic. viii, 7) , "perseverance is about pains of touch." But these belong to temperance. Therefore perseverance is a part of temperance rather than of fortitude.
Obj. 2: Further, every part of a moral virtue is about certain passions which that virtue moderates. Now perseverance does not imply moderation of the passions: since the more violent the passions, the more praiseworthy is it to persevere in accordance with reason. Therefore it seems that perseverance is a part not of a moral virtue, but rather of prudence which perfects the reason.
Obj. 3: Further, Augustine says (De Persev. i) that no one can lose perseverance; whereas one can lose the other virtues.” source