But bodily transmutation takes place in all the passions of the soul, as stated above (Q. 22, AA. 1, 3). Therefore sorrow is not more harmful to the body than the other passions of the soul.
 Thomas Aquinas, Summa Theologica (1274). copy citation

add
Author Thomas Aquinas
Source Summa Theologica
Topic passion 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

“But those things which have only a spiritual existence do not cause a transmutation in the body: as is evident with regard to the images of colors, which images are in the air and do not give color to bodies. Therefore sorrow is not harmful to the body.
Obj. 2: Further if it be harmful to the body, this can only be due to its having a bodily transmutation in conjunction with it. But bodily transmutation takes place in all the passions of the soul, as stated above (Q. 22, AA. 1, 3). Therefore sorrow is not more harmful to the body than the other passions of the soul. Obj. 3: Further, the Philosopher says (Ethic. vii, 3) that "anger and desire drive some to madness": which seems to be a very great harm, since reason is the most excellent thing in man. Moreover, despair seems to be more harmful than sorrow; for it is the cause of sorrow.” source