The Basics of Judaism: Sin and Repentance: The Power of Repentance:
How effective is repentance?
The Talmud says that if a person sincerely repents, his former deeds are counted as if they had been good deeds (Yoma 86b).
Thay may be why in the world to come, those who repent are on an even higher level than the righteous (Berachos 34b).
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