Repenting is neither more nor less than crying out to God in Christ, “Lord be merciful to me, a sinner.” Believing is rejoicing in the faithfulness of His promise, that as we so repent, we go home justified. It is not the depth and power of your repentance that earns God’s favor. None of us repent as deeply as we ought, and so must ever repent for the weakness of our repentance. But Jesus came to save sinners.