He can't and won't on his own, but by the conviction of the Holy Spirit.
That’s the opposite of what’s said. The law comes through the Holy Spirit.
Here’s something else to consider.
Do you not understand that everything that goes into the mouth passes into the stomach, and is eliminated? But the things that proceed out of the mouth come from the heart, and those defile the man. For out of the heart come evil thoughts, murders, adulteries, fornications, thefts, false witness, slanders. These are the things which defile the man; but to eat with unwashed hands does not defile the man.”
— Matthew 15:17-20
There’s no “unless clause”.
And this
Now the deeds of the flesh are evident, which are: immorality, impurity, sensuality, idolatry, sorcery, enmities, strife, jealousy, outbursts of anger, disputes, dissensions, factions, envying, drunkenness, carousing, and things like these, of which I forewarn you, just as I have forewarned you, that those who practice such things will not inherit the kingdom of God.
— Galatians 5:19-21
Just some things to ponder.