Deuteronomy 29:17-19 21st Century King James Version (KJ21)
18 lest there should be among you man or woman or family or tribe, whose heart turneth away this day from the Lord our God to go and serve the gods of these nations, lest there should be among you a root that beareth gall and wormwood, (wormwood is bitterness)
Wormwood is only mentioned once in the Book of Revelation: Revelation 8 verse 10. “The third angel sounded his trumpet, and a great star, blazing like a torch, fell from the sky on a third of the rivers and on the springs of water— the name of the star is Wormwood. A third of the waters turned bitter, and many people died from the waters that had become bitter.” (Rev 8:10–11)
19 and it come to pass, when he heareth the words of this curse, that he bless himself in his heart, saying, ‘I shall have peace, though I walk in the imagination of mine heart’—to add drunkenness to thirst.
The soil of bitterness is a heart that harbors hostility and does not deal with hurt by the grace of God.
When someone becomes bitter, the bitterness takes root in the heart and grows deeper. A bitter person is easily hurt, insincere, holds grudges, and has mood swings.
The Fruit Of Bitterness will affect us physically, emotionally, and spiritually because the fruit of bitterness is an acid that eats up everything.
Hebrews 12:14-15 New International Version (NIV)
Warning and Encouragement
14 Make every effort to live in peace with everyone and to be holy; without holiness no one will see the Lord. 15 See to it that no one falls short of the grace of God and that no bitter root grows up to cause trouble and defile many.