Don’t you just love definitions? This one is really something!
Eternity defined ― From the Christian Church Doctrinal Statement:
“People were created to exist forever. We will either exist eternally separated from God by sin or eternally with God through forgiveness and salvation. To be eternally separated from God is Hell. To be eternally in union with Him is eternal life. Heaven and Hell are real places of eternal existence.”
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. John 3:16
For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord. Romans 6:23
And whosoever was not found written in the book of life was cast into the lake of fire. Revelation 20:15