Gregory the Great, on Ps 6:7

“I have laboured in my groanings, every night I will wash my bed: I will water my couch with my tears.”

“For there are many things which are allowed and legitimate, and yet we are to some extent defiled in the doing of them; as often we attack faults with anger, and disturb the tranquillity of our own mind. And, though what is done is right, yet it is not to be approved that the mind is therein disturbed. For instance, he had been angry against the vices of transgressors who said, "Mine eye is disturbed because of anger." For, since the mind cannot, unless it be tranquil, lift itself up to the light of contemplation, he grieved that his eye was disturbed in anger, because, though assailing evil doings from above, he still could not help being confused and disturbed from contemplation of the highest things. And therefore his anger against vice is laudable, and yet it troubles him, because he felt that he had incurred some guilt in being disturbed.”

Imported from an open dataset — not yet checked against the printed edition.