One ought to love all men equally. Since, however, one cannot do good to all, we ought to consider those chiefly who by reason of place, time or any other circumstance, by a kind of chance, are more closely united to us.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic love reason
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

“26, Art. 6] Whether We Ought to Love One Neighbor More Than Another? Objection 1: It would seem that we ought not to love one neighbor more than another. For Augustine says (De Doctr. Christ. i, 28) : "One ought to love all men equally. Since, however, one cannot do good to all, we ought to consider those chiefly who by reason of place, time or any other circumstance, by a kind of chance, are more closely united to us." Therefore one neighbor ought not to be loved more than another. Obj. 2: Further, where there is one and the same reason for loving several, there should be no inequality of love. Now there is one and the same reason for loving all one's neighbors, which reason is God, as Augustine states” source