To think we can have obedience without forgiveness implies that God is without mercy to those who are obedient (but as humans we cannot be perfectly obedient). To think we can have forgiveness without obedience makes a mockery of the cross. Those who ask for forgiveness must believe and those who believe, obey. To not obey Him is not to believe him. Obedience and belief are synonomous. Because we are trapped in flesh, we must overcome its' sinful desires and that takes the special power of the Holy Spirit. When we fail, we ask forgiveness and try not to do it again (repent). How can one ask for forgiveness knowing they're going to repeat the same sin again?
No one is good, not one. Our righteousness is as filthy rags. Therefore there is nothing we can do to obtain grace, lest we boast. It is only by faith that we are saved. Even the bible biggies failed. Moses murdered, David murdered, Solomon lusted and commited idolatry, etc...