Hebrews 12:15
See to it that no one comes short of the grace of God; that no root of bitterness springing up causes trouble, and by it many be defiled.
Bitterness is usually associated with anger and grudges. But is that what it means in Hebrews 12:15? I don’t think so. Let’s ask a few questions. First of all, does “root of bitterness” mean that the root is bitterness (like block of wood)? Or does it mean that the root grows up into a plant and bears the bitter fruit? So “of bitterness” then would mean “giving rise to bitterness,” as in the phrase, “news of great joy.” Second, does “bitterness,” in Hebrews 12:15, mean “festering anger,” or does it mean “poisonous and foul”? Third, where did this image of a “root of bitterness” come from?
Let’s start with the last question. Answer: It came from Deuteronomy 29:18. “Beware lest there be among you a man or woman or family or tribe, whose heart turns away this day from the Lord our God to go and serve the gods of those nations; lest there be among you a root bearing poisonous and bitter fruit”. This background also helps us answer the first two questions: The root is not itself bitterness, but rather bears the fruit of bitterness. And the bitterness it bears is something poisonous. This bitter fruit may be festering anger, or it may be something else. The point seems to be that it is deadly.
The key question is, What is this root that causes deadly, bitter fruit to sprout in the church? The next verse in Deuteronomy 29 gives the surprising answer, and it fits perfectly with the book of Hebrews. Verse 18 ends: “… lest there be among you a root bearing poisonous and bitter fruit.” Then verse 19 begins by defining this root: “One who, when he hears the words of this sworn covenant, blesses himself in his heart, saying, ‘I shall be safe, though I walk in the stubbornness of my heart.’ This would lead to the sweeping away of moist and dry alike” .
What then is the root that brings forth the bitter fruit? It is a person who has a wrong view of eternal security. He feels secure when he is not secure. He says, “I shall be safe [secure], though I walk in the stubbornness of my heart.” He misunderstands the covenant God makes. He thinks that because he is part of the covenant people, he is secure from God’s judgment.
This kind of presumption is what the book of Hebrews deals with repeatedly—professing Christians who think they are secure because of some past spiritual experience. The aim of Hebrews is to cure Christians of presumption and to cultivate earnest perseverance in the full assurance of faith and holiness. At least four times it warns us that we must not neglect our great salvation but rather be vigilant to fight the fight of faith every day lest we become hardened and fall away and prove that we had no share in Christ (2:3; 3:12–14; 6:4–7; 10:23–29).
This is also the very point of the context of the term “root of bitterness” in Hebrews 12:15. “Pursue peace with all men, and the sanctification without which no one will see the Lord. See to it that no one comes short of the grace of God; that no root of bitterness springing up causes trouble, and by it many be defiled” (12:14–15). This is a warning not to let the attitude of Deuteronomy 29:19 take root, “I shall be safe, though I walk in the stubbornness of my heart” (rsv). It is a warning not to treat holiness lightly or to presume upon more grace.
Therefore a “root of bitterness” is 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. Such a person or a doctrine defiles many and can lead to the experience of Esau, who played fast and loose with his inheritance and could not repent in the end. “[Let] there be no immoral or godless person like Esau, who sold his own birthright for a single meal. For you know that even afterwards, when he desired to inherit the blessing, he was rejected, for he found no place for repentance, though he sought for it [the repentance] with tears” (Hebrews 12:16–17). That would be bitter indeed. Don’t let a root grow up in the church or in your life that would spread such cavalier treatment of our great inheritance. Beware!