Now as man could not live in society without truth, so likewise, not without joy, because, as the Philosopher says (Ethic. viii) , no one could abide a day with the sad nor with the joyless.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic society truth
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

“For it regards merely a certain debt of equity, namely, that we behave pleasantly to those among whom we dwell, unless at times, for some reason, it be necessary to displease them for some good purpose.
Reply Obj. 1: As we have said above (Q. 109, A. 3, ad 1) , because man is a social animal he owes his fellow-man, in equity, the manifestation of truth without which human society could not last. Now as man could not live in society without truth, so likewise, not without joy, because, as the Philosopher says (Ethic. viii) , no one could abide a day with the sad nor with the joyless. Therefore, a certain natural equity obliges a man to live agreeably with his fellow-men; unless some reason should oblige him to sadden them for their good.
Reply Obj. 2: It belongs to temperance to curb pleasures of the senses.” source