Nicene and Post-Nicene Fathers, Ser. II, Vol. XI:
The Works of John Cassian.: Chapter XV. How vainglory intoxicates the mind.

Chapter XV.

How vainglory intoxicates the mind.

And so the miserable soul is affected by such vanity—as if it were deluded by a profound slumber—that it is often led away by the pleasure of such thoughts, and filled with such imaginations, so that it cannot even look at things present, or the brethren, while it enjoys dwelling upon these things, of which with its wandering thoughts it has waking dreams, as if they were true.