(2) Whether they know single things?
(3) Whether they know the future?
(4) Whether they know secret thoughts?
(5) Whether they know all mysteries of grace? _______________________
FIRST ARTICLE [I, Q. 57, Art. 1]
Whether the Angels Know Material Things?
Objection 1: It would seem that the angels do not know material things. For the object understood is the perfection of him who understands it. But material things cannot be the perfections of angels, since they are beneath them. Therefore the angels do not know material things.
Obj. 2: Further, intellectual vision is only of such things as exist within the soul by their essence, as is said in the gloss [*On 2 Cor. 12:2, taken from Augustine (Gen. ad lit. xii. 28)]. But the material things cannot enter by their essence into man's soul, nor into the angel's mind. Therefore they cannot be known by intellectual vision, but only by imaginary vision, whereby the images of bodies are apprehended, and by sensible vision, which regards bodies in themselves. Now there is neither imaginary nor sensible vision in the angels, but only intellectual. Therefore the angels cannot know material things.
Obj. 3: Further, material things are not actually intelligible, but are knowable by apprehension of sense and of imagination, which does not exist in angels. Therefore angels do not know material things.
On the contrary, Whatever the lower power can do, the higher can do likewise. But man's intellect, which in the order of nature is inferior to the angel's, can know material things. Therefore much more can the mind of an angel.