From St. Francis de Paola:
Fix your minds on the passion of our Lord Jesus Christ. Inflamed with love for us, he came down from heaven to redeem us. For our sake he endured every torment of body and soul and shrank from no bodily pain. He himself gave us an example of perfect patience and love. We, then, are to be patient in adversity. Put aside your hatred and animosity. Take pains to refrain from sharp words. If they escape your lips, do not be ashamed to let your lips produce the remedy, since they have caused the wounds. Pardon one another so that later on you will not remember the 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.