When a man acts inordinately, the judgment of his reason is cause not only of the simple movement of the will but also of the passion in the sensitive appetite, as stated above.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic passion judgment
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

“The passion of anger, like all other movements of the sensitive appetite, is useful, as being conducive to the more prompt execution [*Cf. I-II, Q. 24, A. 3] of reason's dictate: else, the sensitive appetite in man would be to no purpose, whereas "nature does nothing without purpose" [*Aristotle, De Coelo i, 4] . Reply Obj. 3: When a man acts inordinately, the judgment of his reason is cause not only of the simple movement of the will but also of the passion in the sensitive appetite, as stated above. Wherefore just as the removal of the effect is a sign that the cause is removed, so the lack of anger is a sign that the judgment of reason is lacking. _______________________ QUESTION 159 OF CRUELTY” source