Don’t recall to mind…

Don’t recall to your memory anything your neighbor may have said in a moment of acrimony, whether he insulted you to your face, or spoke evil of you to another and that person has come and reported it to you. If you let yourself become angry, it is but a short step from anger to hatred.
–Saint Maximos the Confessor (580-662)

If we find animosity

If we look inside our hearts and find there even a trace of animosity toward others for the wrongs they have done to us, then we should realize that we are still far removed from the love of God. The love of God absolutely precludes us from hating any human being.
–Saint Maximos the Confessor (580-662)

Recollection of an injury..

The recollection of an injury is itself wrong. It adds to our anger, nurtures our sin, and hates what is good. It is a rusty arrow and poison for the soul. It puts all virtue to flight. It is like a worm in the mind: it confuses our speech and tears to shreds our petitions to God. It is foreign to charity: it remains planted in the soul like a nail. It is wickedness that never sleeps, sin that never fails. It is indeed a daily death.
–Saint Francis of Paola (1416-1507)

The poison of anger…

We must, with God’s help, eradicate the deadly poison of the demon of anger from the depths of our souls. So long as he dwells in our hearts and blinds the eyes of the heart with his somber disorders, we can neither discriminate what is for our good, nor achieve spiritual knowledge, nor fulfill our good intentions, nor participate in true life; and our intellect will remain impervious to the contemplation of the true, divine light; for it is written, “Man’s anger does not bring about the righteousness of God” (Jms. 1:20).
— Saint John Cassian (c. 360-435)