The only thing that breaks the inclination and tendency toward evil that is passed on by parents to their offspring and descendants is the new birth from the Lord that is called regeneration. In the absence of rebirth, this inclination not only remains uninterrupted but even grows from one generation to the next and becomes a stronger tendency toward evil until it encompasses evils of every kind…
From what has gone before, it is evident that no evil can be laid aside except by the Lord, working in those who believe in him and who love their neighbor. The Lord, goodwill, and faith form a unity; if we separate them, each one crumbles like a pearl that is crushed to power. How can we become part of that unity? We cannot unless we lay aside at least some of our evils through repentance. I say that we lay aside our evils, because the Lord does not lay them aside by himself without our cooperation.
There is a saying that no one can fulfill the law, especially since someone who breaks one of the Ten Commandments breaks them all (James 2:10-11; Matthew 5:19). But this formulaic saying does not mean what it seems to. The proper way to understand it is that people who purposely or deliberately behave in a way that is contrary to one commandment in effect behave contrary to the rest, because doing something (against one commandment) purposely and deliberately is the same as completely denying that that behavior is sinful and rejecting any argument to the contrary. And people who thus deny and reject the very idea of sin do not care whether any given act is labeled a sin or not.
This is the type of resolve developed by people who do not want to hear anything about repentance. People who, through repentance, have laid aside some evil that are sins, though, develop a resolve to believe in the Lord and to love their neighbor. They are held by the Lord in a resolution to abstain from many other things as well. Therefore if it happens that because they did not realize what was going on or because they were overwhelmed by desire, they commit a sin, it is not held against them. It was not something they had planned to do, and they do not support what they did.
from Regeneration, Pages 26, 27