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.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic depression contraction
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

“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. Obj. 3: Further, sorrow consumes those who are inflicted therewith, as may be gathered from the words of the Apostle (2 Cor. 2:7) : "Lest perhaps such an one be swallowed up with overmuch sorrow." But that which is depressed is not consumed; nay, it is weighed down by something heavy, whereas that which is consumed enters within the consumer.” source