John Chrysostom
He ought to have repented from the heart. He ought to have wept, but he does this only hypocritically. "Perhaps it may be forgiven you." Peter said this not because he would not be forgiven if he wept, but because the prophets also customarily threaten in this way. They do not say, "If you do this, it will be forgiven you," but that punishment will certainly follow.
Do you see how doubly he sins who thinks meanly of lofty things? Therefore the apostle commands him to do two things: "Repent and pray, that perhaps the thought of your heart may be forgiven you."
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Thus Simon had planned a wicked deed. Therefore the apostle said to him, "Perhaps it may be forgiven you," knowing that he was incorrigible. Simon, for his part, feared the people and did not dare to repent. If he had not been troubled, he would have said, "I did not know. I acted thoughtlessly."
But he was struck first by the signs being performed before him, and second because what was hidden in his soul had become manifest. Therefore he went far away, to Rome, where the apostle had not yet arrived.