Many people have expressed puzzlement at the Rambam's ommision of the famous talmudic rule [Yoma 86b] that if one does teshuva out of love of Hashem all of his sins become merits [זדונות נעשות לו כזכיות].
I saw that one Jew claimed that this was alluded to by the Rambam [Teshuva 7/8]:
The manner of Baalei Teshuvah is to be very humble and modest.
If fools shame them because of their previous deeds, saying to them: "Yesterday, you would commit such and such [sins]. Yesterday, you would commit these and these [transgressions]," they will pay no attention to them. On the contrary, they will hear [this abuse] and rejoice, knowing that it is a merit for them. Whenever they are embarrassed for the deeds they committed and shamed because of them, their merit increases and their level is raised.
As for me - I REALLY don't think so. The Rambam is not referring to all of one's sins turning into merits through teshuva, just that it is a great merit to remain silent in the face of abuse.
ושערי התירוצים לא ננעלו....