W. Austin Gardner
What happens when we can't forgive!?
Here, Paul put his finger on the basic cause of a bitter attitude: We cannot forgive people. An unforgiving spirit is the devil’s playground, and before long it becomes the Christian’s battleground.
If somebody hurts us, either deliberately or unintentionally, and we do not forgive him, then we begin to develop bitterness within, which hardens the heart. We should be tenderhearted and kind, but instead we are hardhearted and bitter.
Actually, we are not hurting the person who hurt us; we are only hurting ourselves. Bitterness in the heart makes us treat others the way Satan treats them, when we should treat others the way God has treated us. In His gracious kindness, God has forgiven us, and we should forgive others.
We do not forgive for our sake (though we do get a blessing from it) or even for their sake, but for Jesus’ sake. Learning how to forgive and forget is one of the secrets of a happy Christian life.
Warren W. Wiersbe, The Bible Exposition Commentary, vol. 2 (Wheaton, IL: Victor Books, 1996), 43.
Check out the Society of Mentors. This is a meeting of mentors who desire to personally grow while continually impacting others with reaching the world with the gospel.