Get rid of all hard feelings, anger and rage. Stop all fighting and lying. Don't have anything to do with any kind of hatred. Ephesians 4: 31 NLT
Bitterness means to be unhappy and angry because of a situation that has occurred. The Bible says that we should get rid of these such feelings. Bitterness and anger do not come from the Father. These are emotions that the enemy plants in our heart because of an event that has happened. Other toxic emotions come along with bitterness. These are anger, fighting, lying and hatred. Don't allow the enemy to deceive you. Forgive quickly and get rid of bitterness.