Saint Barsanuphius of Optina.
Do you know the Devil's tactics? You really need to know it. When the Devil knows that some man has a sin more or less serious, he tries to prevent him from repentance. To this end, he belittles the severity of the sin in any way, suggesting the following thoughts: "It does not matter, God will forgive this to you" - and so on. And the demon even tries to make a man forget about this sin. But when this man manages to confess the sin to his spiritual father in the confession, the Devil in every way increases the severity of sin, suggesting that this sin is so great that God will never forgive it. And he tries to bring a person into depression and despair. You see how cunning the enemy is. He knows that the sins are washed away in the confession, and therefore he does not admit people to confession, and if a man confesses, the enemy embarrasses him in every way.