De Somniis (lib. i-ii)

And being overthrown, he goes on a blind and guideless (I will not say path, but pathless) way through life, being pricked with thorns and briars; and sometimes too he falls down steep places, and tumbles down upon other people, so as to hurt both them and himself in a pitiable manner.

But the deep and long-enduring sleep in which every wicked man is held, removes all true conceptions, and fills the mind with all kinds of false images, and unsubstantial visions, persuading it to embrace what is shameful as praiseworthy. For at one time it dreams of grief as joy, and does not perceive that it is looking at the vine, the plant of folly and error.