10 Errors to Avoid When Talking about Sanctification and the Gospel

Error #1: The good we do can in some small way make us right with God.
Error #2: We must be good Christians so that God will keep loving us.
Error #3: If sanctification is a work of divine grace in our lives, then it must not involve our effort.
Error #4: Warning people of judgment is law and has no part to play in preaching the gospel.
Error #5: There is only one reason Christians should pursue sanctification and that's because of our justification.
Error #6: Since we cannot obey God's commandments perfectly, we should not insist on obedience from ourselves or from others.
Error #7: The Ten Commandments should be preached in order to remind us of our sin, but not so that believers may be stirred up to try to obey the commandments.
Error #8: Being fully justified as Christians, we should never fear displeasing God or offending him.
Error #9: The only proper ground for assurance is in the promises of God found in the gospel.
Error #10: Threats and exhortations belong to the terrors of the law and are not to be used as a motivation unto holiness.

Source: http://thegospelcoalition.org/blogs/kevindeyoung/2013/11/05/10-errors-to-avoid-when-talking-about-sanctification-and-the-gospel/