What does the Bible say about bitterness?

Harboring bitterness and explosive anger will secretly destroy your life from the inside out. How does a single, lingering grievance mutate into a treacherous "bitter root" that sparks malicious slander, endless hostility, and a stubborn refusal to forgive? The stark warnings of Ephesians 4 and Hebrews 12 expose the terrifying, devilish trajectory of a heart that willfully holds onto an offense. Find out exactly why nursing this intense antagonism is a direct rebellion against God, and grasp the vital, scriptural steps you must take to uproot this venom before it permanently defiles your faith and ruins the people you love.

Source Article: www.gotquestions.org/Bible-bitterness.html