Isaiah 43:25 I, even I, am he who blots out your transgressions, for my own sake, and remembers your sins no
Under the New Covenant of which is alluded to here sins are forgotten altogether,
as it states in Jeremiah concerning the New Covenant:
"For I will forgive their wickedness and will remember their sins no more."Jer
31:34 The Hebrew word here used for "blot out" according to the
lexicon means to wipe out, obliterate or exterminate. 1Cor 3:11-15
that those parts of our lives which have not been in service to the Lord
are burned up and are counted as waste. These constitute the essence of
the concept of the forgiveness of sins.
God does this for his own sake in that it reveals his character of graciousness.
Graciousness is that character quality in which mercy and generosity is
shown to the undeserving. And this I think is the main purpose
for creating man, namely that through redemption God would glorify His
character quality of graciousness.