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

The certainty of God's promise of eternal life is grounded in His immutable nature and the faithful revelation of Scripture. Paul states in Titus 1:2 that this promise was made 'before the world began.' Thus, the promise is underpinned by God's eternal purpose and unyielding character—He cannot lie. Furthermore, the fulfillment of this promise is manifest in Christ's coming, death, and resurrection, which serve as the foundation for our faith in receiving eternal life. John 5:24 further affirms this by stating, 'He that hears my word and believes has everlasting life,' highlighting that faith in Christ secures this promise.