What accusation is a sign that you are truly preaching the grace of God?
Being accused of preaching a gospel that lets people do as they please because they are under God's grace is the sign. That charge often arises when grace is truly proclaimed, since some will misunderstand it as permission to sin, though grace is not license.
Les explains that very few people even today understand God's grace. He cites a writer who said that unless you are accused of teaching a Gospel that gives people the idea they can now do as they please because they are under the grace of God, you are probably not preaching the Gospel of the grace of God. Paul himself was falsely accused of preaching that just because God's grace is great, one may go ahead and sin as one wishes. Les clarifies that grace is not license, but God's grace is greater than any person's sin, and the Gentiles saved out of immoral idolatry illustrate that.