Revelation 8:11 - "the waters became wormwood; and many men died of the waters, because they were made bitter." - Wormwood is something that is bitter. Wormwood in this passage affects many people, it kills them. Many times when we are bitter we are spiritual wormwood. We affect others & may even kill their spirits. If you are battling bitterness ask God to help you forgive now & don't be walking wormwood.