Now carefulness and indignation imply that the soul is uplifted, which is contrary to being depressed. Therefore depression is not an effect of sorrow.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic depression sorrow
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

“Objection 1: It would seem that it is not an effect of sorrow to burden the soul. For the Apostle says (2 Cor. 7:11) : "Behold this self-same thing, that you were made sorrowful according to God, how great carefulness it worketh in you: yea, defence, yea indignation," etc. Now carefulness and indignation imply that the soul is uplifted, which is contrary to being depressed. Therefore depression is not an effect of sorrow. Obj. 2: Further, sorrow is contrary to pleasure. But the effect of pleasure is expansion: the opposite of which is not depression but contraction. Therefore depression should not be reckoned as an effect of sorrow.
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