R. Levi Yitzchak once approached a sinner who was known as a difficult tormentor and ruffian and told him that “it is possible that I should be jealous of you.”
When the man was perplexed as to how, R. Levi Yitzchak explained: ‘Our sages state (Talmud, Yoma 86b) “repentance is so great that premeditated sins are accounted as though they were merits.’
“Now, imagine, how many merits a great sinner like yourself would have were they to repent with a complete heart and all those sins would be transformed into merits. You would surely have more merits than I have.”
R. Levi Yitzchak spoke to him convincingly until the man repented.