Whatever we do or suffer for a friend is pleasant, because love is the principal cause of pleasure.
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Original Citation
Saint Thomas Aquinus. Summa Theologica. c. 1274, pt. 1-2.
Current Citation
Saint Thomas Aquinus. The Summa Theologica of St. Thomas Aquinas, translated by Fathers of the English Dominican Provinc. Christian Classics, 1981, pt. 1-2.