Jesus didn't set us free to sin. He set us free from it. If you have taken the relaxed and kicked back view of God because of grace, then be challenged to pursue Him with Holiness! He is a rewarder of those who diligently pursue Him. Don't let grace be your license to not deal with or repent of sin. Past present or future. It is a fearful thing to fall into the hands of a living God.
Heb 10:31 It is a fearful thing to fall into the hands of the living God.