==deuteronomy 29:18-19:

​I am making this covenant with you so that no one among you — no man, woman, clan, or tribe — will turn away from the Lord our God to worship these gods of other nations, and so that no root among you bears bitter and poisonous fruit”
​“Those who hear the warnings of this curse should not congratulate themselves, thinking, ‘I am safe, even though I am following the desires of my own stubborn heart.’ This would lead to utter ruin!” 

​ Hebrews 12:15. “See to it that no one misses the grace of God and that no bitter root grows up to cause trouble and defile many.

​July 14, 2023: Philip Wijaya wrote: This was a call for the Israelites (and the future generations) to be faithful to the Lord. They were warned not to commit idolatry by worshipping the gods or idols of other nations. Such idolatry is a rebellious act that causes bitterness (i.e., a root that bears bitter and poisonous fruit).
Notice that this root of bitterness is further explained in the following verse: “Those who hear the warnings of this curse should not congratulate themselves, thinking, ‘I am safe, even though I am following the desires of my own stubborn heart.’ This would lead to utter ruin!” (Deuteronomy 29:19, NLT). It is manifested as a person who has a wrong view of eternal security.
John Piper defines the root of bitterness as “a person or a doctrine in the church which encourages people to act presumptuously and treats salvation as an automatic thing that does not require a life of vigilance in the fight of faith and the pursuit of holiness.”

==deuteronomy 29:29:

 “The secret things belong to the Lord our God, but the things that are revealed belong to us and to our children forever, that we may do all the words of this law”.
​

There are two main principles communicated in this verse. One, this verse clearly states that some things are “secret” – only God knows them. He, in his infinite wisdom, has chosen not to reveal everything to us. The secret things are things that we sometimes wish we knew: When exactly will Christ return? Who will I marry? Which career path should I choose? Why did this bad thing happen to me – what good can possibly come of it? Etc. But we are to be content with not knowing. We are to trust God, and we are to obey what he has revealed. That is the second principle communicated in this verse. God, though he has not revealed all things, has revealed some things. The things that he has revealed “belong to us and to our children forever, that we may do all the words of this law.” - Emmaus Reformed Baptist Church