Have we not all done evil? (1 John 1:10, Romans 3:23). Therefore, according to your verse (especially in the kjv), all will be raised unto the resurrection of condemnation.
Those who are forgiven, their sins have been washed away and they have been made into new creatures in Christ.
And this is by faith alone in Jesus Christ alone.
Of course, the Lord will not deal with any sin in your life apart from you giving Him permission to do so...He requires surrender.
I think that it is indeed a sign of gratitude...see Luke 7:36-50.
If God requires obedience, then there is condemnation over disobedience.
How then are we forgiven?
God does not require obedience of the believer, He merely desires it of us; and He also works within us to make it happen.
The obedience that He "requires" of me is a practical love (1 John 3:17-18); and He also provides that love through faith in Jesus Christ (Galatians 3:14, Romans 5:5).
Thus faith in Jesus is all that He requires of us; because a saving faith is something that will produce love in our hearts, which is the obedience that He "requires"...no, for the believer, he only desires it; because if we are in Christ and are disobedient, we have an Advocate with the Father, Jesus Christ the righteous. We are forgiven of past, present, and future sin(s)...Romans 4:8, Romans 8:37-39, Hebrews 9:12...and therefore if we are disobedient, the penalty has already been paid by Christ's death on the Cross. And therefore, for the believer, obedience is not required (as of a penalty being required for disobedience); it is only desired.
And in this, I find that there is more obedience than when I felt that it was required of me.
Obedience is required only of those who are still under the law.
For those of us who are under grace, obedience is not required; and also sin shall not have dominion over us (Romans 6:14).