Obj. 3: Further, whoever is enlightened is conscious of being enlightened. But man is not conscious of being enlightened by angels.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic angel
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17611/pg17611-images.html

Context

“1:19) , the gloss observes that "not only natural reason availed for the manifestation of Divine truths to men, but God also revealed them by His work," that is, by His creature. But both are immediately from God—that is, natural reason and the creature. Therefore God enlightens man immediately.
Obj. 3: Further, whoever is enlightened is conscious of being enlightened. But man is not conscious of being enlightened by angels. Therefore he is not enlightened by them.
On the contrary, Dionysius says (Coel. Hier. iv) that the revelation of Divine things reaches men through the ministry of the angels. But such revelation is an enlightenment as we have stated (Q. 106, A. 1; Q. 107, A. 2).” source