V. (19) And, in all such matters, it is impossible for the spirit of God to remain and to pass all its time, as the law-giver himself shows. "For," says Moses, "the Lord said, My spirit shall not remain among men for ever, because they are Flesh."[Ge 6:3.] (20) For, at times, it does remain; but it does not remain for ever and ever among the greater part of us; for who is so destitute of reason or so lifeless as never, either voluntarily or involuntarily, to conceive a notion of the all good God. For, very often, even over the most polluted and accursed beings, there hovers a sudden appearance of the good, but they are unable to take firm hold of it and to keep it among them; (21) for, almost immediately, it quits its former place and departs, rejecting those inhabitants who come over to it, and who live in defiance of law and justice, to whom it never would have come if it had not been for the sake of convicting those who choose what is disgraceful instead of what is good. (22) But the spirit of God is spoken of in one manner as being air flowing upon the earth, bringing a third element in addition to water. In reference to which, Moses says, in his account of the creation of the world, "The spirit of God moved upon the face of the Waters."[Ge 1:2.] Since the air, as it is very light, is raised and borne aloft, having water, as it were, for its foundation; and, in another manner, unalloyed knowledge is said to be so, which every wise man naturally partakes of. (23) And Moses shows us this, when speaking of the creator and maker of the holy work of the creation, in these words: "And God summoned Bezaleel, and filled him with his Holy Spirit, and with wisdom, and understanding, and knowledge, to be able to devise every Work."[Ex 31:1.] So that, what the spirit of God is, is very definitively described in these words.