How someone responds to the teaching of grace (God's unconditional love, unmerited kindness, unlimited forgiveness, and unearned blessings freely given us in Jesus and received by faith - Ephesians 1-3) reveals the heart.
Some will misuse grace as a license to sin (Jude 4), exposing them as false believers...godless...as they exchange grace for a license to sin.
There are many who are afraid to teach grace because they fear someone might use it as a license to sin. Their hearts are exposed for not appreciating grace because they have no awareness of their own sin, just like the Pharisees. I am so glad Paul was not in bondage to this fear. He taught grace because his life had been changed by grace (1 Timothy 1:12-17).
When grace is taught, many will be rescued by grace from a lifestyle of sin, such as those in Colossians 1:3-8, whose lives were changed the day they understood God's grace in all its truth. Epaphrus was not afraid to share God's grace with those in Colossae because he feared some might use it as a license to sin. Rather, he shared it because he knew many would be rescued from sin, resulting in life-change.
On the other hand, the law, out of fear and selfishness, props people up and makes them "look good", never exposing the true heart of a person toward the gospel of the grace. By removing the law, their hearts are exposed.
For example, a child may keep his room clean because the "law of mom and dad" says he will be punished if he doesn't and rewarded if he does. Even though the child really doesn't want to keep his room clean, out of a fear of punishment and a selfish desire to receive a reward, he keeps his room clean. But what happens if there is no "law of mom and dad" with blessings and curses that say to "keep your room clean"? Have you ever seen a college dorm room? No law to prop him up.
Only by removing the law from a person professing to be a believer in Christ can one ever see if he or she is a believer based upon his or her response to grace.
Removing the law and teaching grace exposes the true heart of a person to the cross by their response. Paul said that the life he lives he lives by faith in the one (Jesus) who loved him and gave his life for him, therefore he did not set aside grace by living under law (Galatians 2:21-22)..
What will the response be of those who hear the good news of God's grace?
What will the response be of those who hear they are no longer under law but under grace?
What will the response be of those who hear all their sins are forgiven in Christ?
What will be the response of those who hear they are righteous before God by grace through faith in Jesus, apart from the law?
Will it be the response of those in Jude 4 or the response of the Colossians and Paul?
Will it be like the Judaizers, Pharisees, and teachers of the law who accused Paul of giving people a license to sin?
Only through the teaching of grace will we ever know.