Good sense makes one slow to anger,
and it is his glory to overlook an offense. - Prov. 19:11 ESV

[I]t is not what goes into the mouth that defiles a person, but what comes out of the mouth; this defiles a person. - Matt. 15:11 ESV

Love ... is not easily angered, it keeps no record of wrongs. - 1 Cor. 13:5 NIV

[A]s the Lord has forgiven you, so you also must forgive. - Col. 3:13 ESV

For me these things are hard, and in anger I have unhelpfully defiled myself more than once in response to a perceived offense. Far more satisfying has been finding the grace to hold my tongue and gain perspective in a cooler moment, leaving undiminished the potential for joy and fruitfulness in the relationship.