Thomas Aquinas

“ Now when the mind turns itself to the actual consideration of any habitual knowledge, then a person speaks to himself; for the concept of the mind is called "the interior word." And by the fact that the concept of the angelic mind is ordered to be made known to another by the will of the angel himself, the concept of one angel is made known to another; and in this way one angel speaks to another; for to speak to another only means to make known the mental concept to another. ”

“ Now it is clear that the angels are called superior or inferior by comparison with this principle, God; and therefore enlightenment, which depends on the principle which is God, is conveyed only by the superior angels to the inferior. But as regards the will as the principle, he who wills is first and supreme; and therefore the manifestation of what belongs to the will, is conveyed to others by the one who wills. In that manner both the superior angels speak to the inferior, and the inferior speak to the superior. ”

“ But because truth is the light of the intellect, and God Himself is the rule of all truth; the manifestation of what is conceived by the mind, as depending on the primary truth, is both speech and enlightenment ”

“ External speech, made by the voice, is a necessity for us on account of the obstacle of the body. Hence it does not befit an angel; but only interior speech belongs to him, and this includes not only the interior speech by mental concept, but also its being ordered to another's knowledge by the will. So the tongue of an angel is called metaphorically the angel's power, whereby he manifests his mental concept. ”

“ There is no need to draw the attention of the good angels, inasmuch as they always see each other in the Word; for as one ever sees the other, so he ever sees what is ordered to himself. But because by their very nature they can speak to each other, and even now the bad angels speak to each other, we must say that the intellect is moved by the intelligible object just as sense is affected by the sensible object. ”

“ In one way for the purpose of giving one thing to another, as in natural things the agent is ordered to the patient, and in human speech the teacher is ordered to the learner; and in this sense an angel in no way speaks to God either of what concerns the truth, or of whatever depends on the created will; because God is the principle and source of all truth and of all will. In another way one thing is ordered to another to receive something, as in natural things the passive is ordered to the agent, and in human speech the disciple to the master ”

“ Further, as was said above (Q [106] , A [1] ) , to enlighten means merely to acquaint one man of what is known to another; and this is to speak. Therefore to speak and to enlighten are the same; so the same conclusion follows. ”