Perfection of charity is essential to Happiness, as to the love of God, but not as to the love of our neighbor.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic perfection happiness
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

“This saying is to be understood of the possession of good that does not fully satisfy. This does not apply to the question under consideration; because man possesses in God a sufficiency of every good. Reply Obj. 3: Perfection of charity is essential to Happiness, as to the love of God, but not as to the love of our neighbor. Wherefore if there were but one soul enjoying God, it would be happy, though having no neighbor to love. But supposing one neighbor to be there, love of him results from perfect love of God. Consequently, friendship is, as it were, concomitant with perfect Happiness.” source