How do we know God's promise of eternal life is true?

God's promise of eternal life is assured through His unchanging nature. In Titus 1:2, Paul emphasizes that this promise was made by God, who cannot lie. This reinforces the truth that God's integrity is aligned with His holiness and perfection. The promise is unconditional to us and is fulfilled through the completed work of Christ on the cross. Because all the promises of God are secure in Christ, believers can confidently affirm the truth of eternal life as a free gift grounded in grace.