I answer that, Since virtue is directed to the good, wherever there is a special aspect of good, there must be a special virtue.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic virtue good
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

“But according to Ethic. viii, 8 "to be honored is almost to be loved." Therefore the religion whereby we honor God is not a special virtue distinct from observance, or dulia, or piety whereby we honor our neighbor. Therefore religion is not a special virtue.
On the contrary, It is reckoned a part of justice, distinct from the other parts.
I answer that, Since virtue is directed to the good, wherever there is a special aspect of good, there must be a special virtue. Now the good to which religion is directed, is to give due honor to God. Again, honor is due to someone under the aspect of excellence: and to God a singular excellence is competent, since He infinitely surpasses all things and exceeds them in every way.” source