The believer’s confidence about possessing eternal life is not grounded in self-effort but in the immutability of Christ’s person and promise. Eternal life is received the moment one believes in Christ, for “whoever believes in Him shall not perish, but have eternal life” (John 3:16b). Once received, eternal life becomes the unbreakable possession of all who trust in Jesus as Savior (John 3:16; 5:24). God’s integrity and righteousness are bound up in the keeping of His Word, and even “if we are faithless, He remains faithful, for He cannot deny Himself” (2 Tim 2:13). Believers are “sealed in Him with the Holy Spirit of promise, who is given as a pledge of our inheritance” (Eph 1:13–14), guaranteeing their final redemption. This means that eternal life is locked in forever. To doubt the permanence of eternal salvation is to question the reliability of the God who cannot lie (Tit 1:2; Heb 6:18).