Grace penetrates a person's life in the same way that light penetrates darkness. It does not just appear to offset darkness, but rather it penetrates it and disperses it. That is what grace does for a human being. It enters into a person's life, penetrates it, and begins dynamically to produce things.
This is what John 1 is about. God came to the earth in the flesh, and He penetrated humanity. The grace of God appeared to man in the person of Jesus Christ. It can be translated that God's grace made its appearance bringing salvation.
Grace can rescue man from the greatest possible evil. What could that possibly be? The greatest possible evil that anybody can face is God's curse. Men can curse us, but if God curses us, we have had it. That curse is the penalty of sin. But God counterbalances that, and more, by giving us grace.
Here, grace is shown as the power that teaches, trains, disciplines, guides, and leads us. It does not force us. In other places, it is shown as counseling, comforting, encouraging, admonishing, guiding, convicting, rewarding, even restraining. It teaches us that we must deny immorality, exhorting us to give ourselves over to self-mastery, that is, to controlling ourselves. We must devote ourselves to integrity and loyalty to God right here and now, while expectantly and patiently looking forward to the return of Jesus Christ and the resurrection from the dead to glory.
John W. Ritenbaugh
Grace Upon Grace