Our sins were forgiven after believing in the Lord, but we still often sin; how can we finally escape the bondage of sin?

The Answer from God’s Word:

The sins of man were forgiven through the agency of the incarnate God, but this does not mean that man no longer has sin within him. The sins of man could be forgiven through the sin offering, but as for just how man can be made to sin no more, and how his sinful nature may be extirpated completely and transformed, he has no way of solving this problem.