Bitterness is strange: when it infects our life, we are usually the last ones to know it. We go through our life thinking things are fine, that we’ve “gotten over” certain losses, but the way other people experience us is different: they can see the hurt we carry. “The heart knows its own bitterness,” says Proverbs 14:10, “and no stranger shares its joy.” It remains one of the more under-diagnosed sins that can destroy our life. What is bitterness? What healing resources might be hidden in the gospel of Jesus Christ?