VII. (28) On which account, it is possible that the spirit of God may remain in the soul, but that it should remain for ever is impossible, as we have said. And why need we wonder? since there is no other thing whatever, the possession of which, is stable and lasting; but mortal affairs are continually wavering in the scale, and inclining first to one side, and then to the other, and liable at different times to different changes. (29) And the greatest cause of our ignorance is the flesh, and our inseparable connection with the flesh. And this, Moses represents God as admitting, where he says that, "Because they are flesh," the spirit of God cannot abide in them. And yet marriage and the rearing of children, and the furnishing of necessary things, and ingloriousness conjoined with a want of money and business, both private and public, and a countless number of other things cause wisdom to waste away, before it begins to flourish vigorously. (30) But there is nothing which is so great a hindrance to its growth as the fleshly nature. For that, as if it were the principal and most solid foundation of folly and ignorance, is laid down firmly, and then each of the aforenamed evils is built up upon it. (31) For those souls which are devoid of flesh and of the body, remaining undisturbed in the theatre of the universe, occupied in seeing and hearing divine things, of which an insatiable desire has seized them, enjoy a pleasure to which no one offers any interruption. But those which bear the heavy burden of the flesh, being weighed down and oppressed by it, are unable to look upwards to the revolutions of the heaven, but being dragged downwards, have their necks forcibly pressed to the ground like so many quadrupeds.