If you look at the particulars Christian teachings, the particulars don’t look that different from many other ethical systems. The difference is that Christianity is never interested in moral behavior simply as moral behavior. In every instance, putting on the new self means to remember your identity.
Being a Christian is ultimately about being melted with spiritual understandings of who you are now that Jesus Christ has said, “You are my beloved child,” of who you are now that the Holy Spirit has come in and said, “I now live within your heart.” Ephesians 4 is an amazingly multifarious passage on what the Christian lifestyle really is. And the purpose of this passage is to show how we can put off the old self and put on the new. 
Let’s look at anger and forgiveness. We’ll look at anger to see 1) suppression or denial of anger is wrong, 2) anger is sometimes required, 3) there are sinful forms of anger, and 4) if you can’t forgive, it’s because you haven’t sensed his forgiveness.
This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on February 3, 1991. Series: Christian Lifestyle. Scripture: Ephesians 4:25-32.
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Released on 5 Mar 2025