How do we know that eternal life is possible?

Eternal life is assured through the redemptive work of Jesus Christ, as expressed in John 3:16, which states, 'For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.' This promise is contingent upon faith in Christ, who bore our sins and secured our place in heaven. The Christian hope lies not in human effort but in the grace of God, which invites sinners to trust in Christ for salvation and eternal communion with Him.