St. Macarius the Great: Cleanse Thou me a sinner

 O God, cleanse Thou me a sinner, inasmuch as I have never done any good thing before Thee. Yea, deliver me from the evil one and let Thy will abide within me, so that I may without condemnation open my unworthy lips and praise Thy Holy name of the Father, and of the Son, and of the Holy Spirit, now and ever, and unto ages of ages. Amen.

+St. Macarius the Great, from The Orthodox Prayer Book

St. Theognostos of Alexandria: The wrath and compassion of God

 We will not be punished or condemned in the age to be because we have sinned, since we were given a mutable and unstable nature. But we will be punished if, after sinning, we do not repent and turn from our evil ways to the Lord; for we have been given the power to repent, as well as the time in which to do so. Only through repentance shall we receive God's mercy, and not its opposite, His passionate anger. Not that God is angry with us: He is angry with evil. Indeed, the divine is beyond passion and vengefulness, though we speak of it as reflecting, like a mirror, our actions and dispositions, giving to each of us whatever we deserve. 

+St. Theognostos of Alexandria¹, from On the Practice of the Virtues, Contemplation and the Priesthood, from The Philokalia, Volume 2.

¹This attribution, by St. Nikodimos, is considered unlikely by scholars.

Fr. John Chryssavgis: God loves us in all our sin

 Man in all his sinfulness is loved by God if he can just keep moving towards God. When one does fall, if one only cries out with confidence, the fall is not into nothingness but into the arms of God stretched open once and for all on the Cross.

+Fr. John Chryssavgis, from Repentance and Confession in the Orthodox Church, Introduction.

St. Maximos the Confessor: On love for others

 Let us love one another, and we shall be loved by God. Let us show longsuffering to each other, an God will show longsuffering towards our sins. Let us not return evil for the evil done to us (cf  Rom 12:17), and we shall not be punished according to our sins. For the forgiveness of our transgressions is to be found in our forgiveness of our brethren. And the mercy of God is to be found hidden in our compassion towards our neighbor... So you see, the Lord has given us a way in which we can be saved, and has endowed us eternally with the capacity to become children of God (cf John 1:12); thus it is on what we ourselves desire that our salvation depends.

+St. Maximos the Confessor, from Ascetic Discourse, #42.

St. Clement of Rome: All have the opportunity to repent

 Let us turn to every ages that has passed, and learn that, from generation to generation, the Lord has granted a place of repentance to all such as would be converted to Him. Noah preached repentance, and as many as listened to him were saved. (Gen 7; 1 Peter 3:20; 2 Peter 2:5) Jonah proclaimed destruction to the Ninevites; (Jonah 3) but they, repenting of their sins, propitiated God by prayer and obtained salvation, although they were aliens [to the covenant] of God.

+St. Clement of Rome, from The First Epistle, chapter 6.