Isaiah 44:22

blotted out--the debt of thy sin from the account-book in which it was entered (Exo 32:32-33; Rev 20:12). as a thick cloud--scattered away by the wind (Psa 103:12). as a cloud--a descending gradation. Not only the "thick cloud" of the heavier "transgressions," but the "cloud" ("vapor" [LOWTH], not so dense, but covering the sky as a mist) of the countless "sins." These latter, though not thought much of by man, need, as much as the former, to be cleared away by the Sun of righteousness; else they will be a mist separating us from heaven (Psa 19:12-13; Jo1 1:7-9). return . . . for--The antecedent redemption is the ground of, and motive to, repentance. We do not repent in order that He may redeem us, but because He hath redeemed us (Zac 12:10; Luk 24:47; Act 3:18-19). He who believes in his being forgiven cannot but love (Luk 7:43, Luk 7:47).

— Jamieson-Fausset-Brown Commentary (public domain)