This sermon, rooted in Hebrews 12, confronts the pervasive and deceptive sin of bitterness, emphasizing that it arises from a failure to embrace God's grace and a self-focused response to injustice. Drawing on the powerful example of Erica Kirk's forgiveness after her husband's assassination, the preacher illustrates how faith in Christ's example—enduring hostility, forgiving enemies, and trusting God's ultimate justice—enables believers to overcome bitterness through grace, not vengeance. The passage warns of the destructive, contagious nature of bitterness, likening it to a root that defiles many, and contrasts it with the life of Christ, who endured the cross for the joy set before Him. Practical steps include seeking God's perspective, reflecting on Joseph's story, destroying mental lists of grievances, and actively choosing not to dwell on wrongs, all grounded in the truth that God's grace is sufficient and His justice perfect. Ultimately, the sermon calls believers to live by faith, availing themselves of divine grace, trusting God to avenge, and embodying Christ's love by forgiving as they have been forgiven, thereby conquering bitterness and glorifying God.