In this second message of Know Your Best Friend, Dr. Youssef proclaims the glorious truth that the Holy Spirit seals every believer in Christ. The Spirit’s seal guarantees ownership by God, eternal security, and authenticity as His children. Just as Paul writes, “You were sealed with the promised Holy Spirit, who is the guarantee of our inheritance” (Ephesians 1:13 –14). Yet many live in fear and doubt, ignoring the Spirit’s assurance. Dr. Youssef urgently reminds us that salvation rests not on human effort but on God’s unshakable promise. With boldness, believers can walk in confidence, knowing the Spirit’s seal marks them forever as Christ’s own.