Reply Obj. 4: Avoidance of evil is caused by the appetite for good, as stated above (Q. 25, A. 2; Q. 39, A. 2) ; and so those passions alone are mentioned which incline to good, as being the causes of those which cause inordinately the avoidance of evil.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic passion evil
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17897/pg17897-images.html

Context

“3: The sense of sight is the most excellent of all the senses, and covers a larger ground, as stated in Metaph. i: and so its name is transferred to all the other senses, and even to the inner apprehensions, as Augustine states (De Verb. Dom., serm. xxxiii) .
Reply Obj. 4: Avoidance of evil is caused by the appetite for good, as stated above (Q. 25, A. 2; Q. 39, A. 2) ; and so those passions alone are mentioned which incline to good, as being the causes of those which cause inordinately the avoidance of evil. ________________________
SIXTH ARTICLE [I-II, Q. 77, Art. 6]
Whether Sin Is Alleviated on Account of a Passion?
Objection 1: It would seem that sin is not alleviated on account of passion. For increase of cause adds to the effect: thus if a hot thing causes something to melt, a hotter will do so yet more.” source