God has already forgiven our sins. And no person can repent of all their sins. Because the bible says all have sinned and fall short of the glory of God. He says in John if we say we have no sin the truth is not in us and we make ourselves a liar.

You will never find that phrase in the bible. Only in new translations that came out in the last 10 years corrupting the word of God.

We are not saved by what we do, but by faith in Christ we do not bring our works/filthy rags to Christ he will say depart from me I never knew you.

The bible says for by grace are you saved through faith and that not of yourselves it is the gift of God, not of WORKS lest any should boast.

You do not brag about repenting of your sins, Turning from sins are a daily struggle and a change of mind/RENEWING of your mind. We should stop sinning, because we love God, not for salvation. Because that is another gospel an achievable gospel.

The bible teaches that the heart of man is utterly wicked and who may know it.