On the Creation of Magistrates (1.46-1.50)

But God replied and said, "The powers which you seek to behold are altogether invisible, and appreciable only by the intellect; since I myself am invisible and only appreciable by the intellect. And what I call appreciable only by the intellect are not those which are already comprehended by the mind, but those which, even if they could be so comprehended, are still such that the outward senses could not at all attain to them, but only the very purest intellect.

And though they are by nature incomprehensible in their essence, still they show a kind of impression or copy of their energy and operation; as seals among you, when any wax or similar kind of material is applied to them, make an innumerable quantity of figures and impressions, without being impaired as to any portion of themselves, but still remaining unaltered and as they were before; so also you must conceive that the powers which are around me invest those things which have no distinctive qualities with such qualities, and those which have no forms with precise forms, and that without having any portion of their own everlasting nature dismembered or weakened.

And some of your race, speaking with sufficient correctness, call them ideas (ἰδέαι), since they give a peculiar character (ἰδιοποίουσι) to every existing thing, arranging what had previously no order, and limiting,

"Do not, then, ever expect to be able to comprehend me nor any one of my powers, in respect of our essence. But, as I have said, I willingly and cheerfully grant unto you such things as you may receive. And this gift is to call you to the beholding of the world and all the things that are in it, which must be comprehended, not indeed by the eyes of the body, but by the sleepless vision of the soul.

The desire of wisdom alone is continual and incessant, and it fills all its pupils and disciples with famous and most beautiful doctrines." When Moses heard this he did not cease from his desire, but he still burned with a longing for the understanding of invisible things. ...... [*]