How do we know Christ's power to grant eternal life is true?

The authenticity of Christ's power to grant eternal life is rooted in His divine identity and His sacrificial work. In John 17:2, Jesus clarifies that He was given power over all flesh to give eternal life to those whom the Father has selected for salvation. This is connected to His role as the Redeemer who completed the work assigned to Him, enabling Him to offer eternal life to His elect. Furthermore, Scripture such as John 5:24 reaffirms that those who hear His word and believe on Him possess everlasting life, cementing the truth of His promises through His authoritative declaration and fulfilled covenant.