Nothing is more serious, nothing more difficult to deal with, as I say repeatedly, than judging and despising our neighbor. Why do we not rather judge ourselves and our own wickedness whcih we know so accurately and about which we have to render an account to God? Why do we usurp God’s right to judge? Why should we demand a reckoning from his creature, his servant? Ought we not to be afraid when we hear about a brother falling into fornication said, ‘He has acted wickedly!’
Wherefore a man can know nothing about the judgments of God. He alone is the one who takes account of all and is able to judge the hearts of each one of us, as he alone is our Master. Truly it happens that a man may do a certain thing (which seems to be wrong) out of simplicity, and there may be something about it which makes more amends to God than your whole life; how are you going to sit in judgment and constrict your own soul? And should it happened that he has fallen away, how do you know how much and how well he fought, how much blood he sweated before he did it? Perhaps so little fault can be found in him that God can look on his action as if it were just, for God looks on his labor and all the struggle he had before he did it, and has pity on him. And you know this, and what God has spared him for, are you going to condemn him for, and ruin your own soul? And how do you know what tears he has shed about it before God? You may well know about the sin, but you do not know about the repentance.
St. Dorotheos of Gaza, On Refusal to Judge Our Neighbor