How do we know eternal life is a promise?

The assurance of eternal life is a fundamental aspect of the Christian faith and is grounded in the promises of God. In Titus 1:2, it is declared that God, who cannot lie, has promised eternal life before the world began. This reinforces the certainty that our salvation and eternal life are not based on our actions but on God’s faithful character and His sovereign grace. Furthermore, in John 3:16, we learn that God gave His Son so that whoever believes in Him should not perish but have eternal life. This promise is sure because it rests on the unchanging nature of God.