The Basics: The Bible warns that bitterness is both dangerous and self-destructive.
All bitterness, anger and wrath, insult and slander must be removed from you, along with all wickedness. And be kind and compassionate to one another, forgiving one another, just as God also forgave you in Christ.
– Ephesians 4:31-32 HCSB
But if you harbor bitter envy and selfish ambition in your hearts, do not boast about it or deny the truth. Such “wisdom” does not come down from heaven but is earthly, unspritual, of the devil. For where you have envy and selfish ambition, there you find disorder and every evil practice.
– James 3:14-16 NIV
But now you must also put away all the following: anger, wrath, malice, slander, and fithly language from your mouth.
– Colossians 3: 8 HCSB
A Basic Tip: Holding a grudge? Drop it! Remember, holding a grudge is like letting somebody live rent-free in your brain… so don’t do it!
Bitterness is a settled hostility that poisons the whole inner person.
To hold onto the bitterness inside only continues to hurt yourself. The other party basically wins because you’re still harboring bad thoughts and caught up in the issue. Let it go – give it God, ask Him to protect you from these feelings and help you overcome them. I’m not sure who said it, but carrying bitterness is like having an annoying monkey on your back. You’re carrying this extra weight and it’s terribly bringing you down. Forgive.
Further Study: Bitterness
Bitterness of the soul:
9 Fools mock at making amends for sin,
but goodwill is found among the upright.
10 Each heart knows its own bitterness,
and no one else can share its joy.
11 The house of the wicked will be destroyed,
but the tent of the upright will flourish.
– Proverbs 14:10