IF THOU, O man, dost not forgive everyone who has sinned against thee, then do not trouble thyself with fasting. If thou dost not forgive the debt of thy brother, with whom thou art angry for some reason, then thou dost fast in vain God will not accept thee. Fasting will not help thee, until thou wilt become accomplished in love and in the hope of faith. Whoever fasts and becomes angry, and harbors enmity in his heart, such a one hates God and salvation is far from him.
St. Ephraim the Syrian