Augustine of Hippo

"My eye is disordered by anger" [Psalm 6:7]: is it by his own, or God's anger, in which he makes petition that he might not be reproved, or chastened? But if anger in that place intimate the day of judgment, how can it be understood now? Is it a beginning of it, that men here suffer pains and torments, and above all the loss of the understanding of the truth; as I have already quoted that which is said, "God gave them over to a reprobate mind"? [Romans 1:28] For such is the blindness of the mind. …

Exposition on Psalm 6 ↗

Gregory the Dialogist

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. …

Register of Epistles, Book 11, Epistle 64 ↗

Thomas Aquinas

Next, when he says "My eye is troubled," he sets forth the failure of reason. For sorrow is the cause of anger; and therefore one who is sorrowful easily grows angry. But anger always disturbs the eye of reason. And those who are disturbed foresee less well. And therefore he says: "My eye is troubled," that is, my reason, "but by the fury of others." For David was angry and troubled when he saw that Absalom his son and his counselors had risen against him. Or "by his own fury," because he was troubled against his own sins. …

Exposition on the Psalms of David ↗