Don Carson expounds on 1 John 5:4–21 and our assurance of salvation through faith in Christ. Carson addresses interpretations of John’s writings, particularly the symbolism of water and blood, which affirm Jesus’s baptism, death, and divine nature. Emphasizing the importance of grounding our assurance in God’s promises, Carson encourages believers to deepen their understanding of Jesus’s identity and the transformative power of faith in him alone.