Sin shall no longer be your master, because you are not under the law, but under grace. Paul makes something revolutionary clear here: It is not the law that frees from sin, it is grace.
Many think more rules bring more holiness. But Paul says the opposite. Grace gives you the standing from which you live differently. Not pressure from outside, but transformation from within. You are placed under grace, and that is exactly what breaks the power of sin.
Today you can stop trying to force holiness through effort and start living from grace.