be ye kind - Ephesians 4:32
"And be ye kind one to another, tender-hearted, forgiving one another, even as God for Christ’s sake hath forgiven you." (Ephesians 4:32)
Dr. Marsh Jones writes in "Biblical Perspective" for this week's lesson:

Kindness, generosity, and compassion are all traits that a Christian constantly displays. Christ has given us an example of this in His behavior toward those to whom He ministered and those who were His detractors: “When he was reviled, [he] reviled not again; when he suffered, he threatened not” (1 Peter 2:23). The apostle also reminded us that when we feel unwilling to forgive someone who has wronged us, we should remember that Christ has forgiven us for the stupid and sinful things that we have done in the past. We should therefore forgive those who are only acting as we might have acted were it not for the grace of God!

Discussion: Why do we have difficulty being kind to anyone when we will not forgive a particular someone(s)?
Source: Galatians and Ephesians, Adult Teacher's Insights, page 72.