On Judgement and Justification:

A brother at Scetis committed a fault. A council was called to which Abba Moses was invited, but he refused to go to it. Then the priest sent someone to say to him, ‘Come, for everyone is waiting for you.’ So he got up and went. He took a leaking jug, filled it with water and carried it with him. The others came out to meet him and said to him, ‘What is this, Father?’ The old man said to them, ‘My sins run out behind me, and I do not see them, and today I am coming to judge the errors of another.’ When they heard that they said no more to the brother but forgave him.

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The monk [or Christian] must die to his neighbor and never judge him at all, in any way whatever.

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If we are on the watch to see our own faults, we shall not see those of our neighbor…To die to one’s neighbor is this: To bear your own faults and not to pay attention to anyone else wondering whether they are good or bad. Do no harm to anyone, do not think anything bad in your heart towards anyone, do not scorn the man who does evil…Do not rail against anyone, but rather say, ‘God knows each one.’ Do not agree with him who slanders, do not rejoice at his slander, and do not hate him who slanders his neighbor.

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This is what it means not to judge. Do not have hostile feelings towards anyone and do not let dislike dominate your heart; do not hate him who hates his neighbor.

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If the monk does not think in his heart that he is a sinner, God will not hear him. A brother asked, ‘What does that mean, to think in his heart that he is a sinner?’ Then Abba Moses said, When someone is occupied with his own faults, he does not see those of his neighbor.

ST. MOSES THE BLACK