“First, on the part of the object understood; thus whoever understands or is enlightened, knows that he understands or is enlightened, because he knows that the object is made known to him. Secondly, on the part of the principle; and thus it does not follow that whoever understands a truth, knows what the intellect is, which is the principle of the intellectual operation. In like manner not everyone who is enlightened by an angel, knows that he is enlightened by him.
SECOND ARTICLE [I, Q. 111, Art. 3]
Whether the Angels Can Change the Will of Man? Objection 1: It would seem that the angels can change the will of man. For, upon the text, "Who maketh His angels spirits and His ministers a flame of fire" (Heb.”