Root of bitterness

“looking carefully lest anyone fall short of the grace of God; lest any root of bitterness springing up cause trouble, and by this many become defiled;” Hebrews 12:15

The person contaminated by grudges becomes hostage to hell. Besides losing the Grace of God, he can also contaminate many others to divert from the Way. …it would be better for him if a millstone were hung around his neck, and he were drowned in the depth of the sea. Matthew 18:6