So should the one inflamed with anger not pray at all? By no means! But instead of reaching for what is unattainable and even dangerous on account of his passionate condition, he should resort to those “short and intense” invocations of Christ, mentioned everywhere in the early monastic literature: those “short prayers” (as Augustine calls them), out of which the well-known “Jesus Prayer” developed.

If you want to put the enemy to flight, pray without ceasing.

These “concise,” “terse,” “repeated,” indeed “ceaseless” short prayers are the daily bread of whoever is tempted—even of him who is tempted directly by the demon of anger.

Dragon’s Wine and Angel’s Bread: The Teaching of Evagrius Ponticus on Anger and Meekness
Gabriel Bunge