“Confess your sins one to another,” bids us the disciple and brother of the Lord, “and pray one for another, that we may be healed;” and, “if we confess our sins,” the beloved disciple pledges himself also, “He is faithful and just to forgive us our sins, and to cleanse us of all unrighteousness.” How shall I confess? By imitating the prodigal in falling down and crying out to the Lord with contrite heart and humbleness of spirit, “I have sinned against heaven and in thy sight; receive me, Father, in my repentance.”
How shall I confess? By departing from error and by abominating sin. For it thou shalt turn, and humble thyself before the Lord, and remove unrighteousness far from thy habitation, the Almighty shall be thy helper. And, “Turn ye to me, and I will turn to you,” saith the Lord Almighty. How shall I confess? By turning with all my heart, and by humbling myself with fasting and lamentation and rending of the heart. “For now,” saith the Lord our God, “turn ye to me with all your heart, and with fasting and with weeping and with lamentation; and rend your hearts and not your garments, and turn to the Lord your God, for He is merciful and compassionate, long-suffering and plenteous in mercy.” How shall I confess? By pitying the poor and the beggar, and by forgiving my neighbor’s faults.
For it says, “The merciful shall obtain mercy,” and, “forgive and it shall be forgiven you,” and “a man’s mercy is to Him as a signet,” and it is a good gift to them that do it before the most High. Thus is sin wiped out, thus are we cleansed of faults.
(St. Photius, The Homilies of Photius, Patriarch of Constantinople, pp. 45-46)