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FIRST ARTICLE [I, Q. 55, Art. 1]
Whether the Angels Know All Things by Their Substance?
Objection 1: It would seem that the angels know all things by their substance. For Dionysius says (Div. Nom. vii) that "the angels, according to the proper nature of a mind, know the things which are happening upon earth." But the angel's nature is his essence. Therefore the angel knows things by his essence.
Obj. 2: Further, according to the Philosopher (Metaph. xii, text. 51; _De Anima_ iii, text. 15), "in things which are without matter, the intellect is the same as the object understood." But the object understood is the same as the one who understands it, as regards that whereby it is understood. Therefore in things without matter, such as the angels, the medium whereby the object is understood is the very substance of the one understanding it.
Obj. 3: Further, everything which is contained in another is there according to the mode of the container. But an angel has an intellectual nature. Therefore whatever is in him is there in an intelligible mode. But all things are in him: because the lower orders of beings are essentially in the higher, while the higher are in the lower participatively: and therefore Dionysius says (Div. Nom. iv) that God "enfolds the whole in the whole," i.e. all in all. Therefore the angel knows all things in his substance.
_On the contrary,_ Dionysius says (Div. Nom. iv) that "the angels are enlightened by the forms of things." Therefore they know by the forms of things, and not by their own substance.
_I answer that,_ The medium through which the intellect understands, is compared to the intellect understanding it as its form, because it is by the form that the agent acts. Now in order that the faculty may be