How do we know that eternal life is promised by God?

The assurance of eternal life is foundational to the Christian faith and is explicitly promised by God in Scripture. Titus 1:2 states that God has promised eternal life before the world began, emphasizing its certainty due to God's unchanging nature. In Hebrews 6:18, we learn that it is impossible for God to lie, making His promises secure. This divine assurance is reflected in the gospel narratives, where Jesus Himself speaks of eternal life as a gift to those who believe in Him (John 3:16). Additionally, 2 Timothy 1:9 elaborates on the holy calling not based on our works, but on God's purpose and grace, underscoring that eternal life is granted solely through His sovereign initiative.