The Gospel of John mentioned “eternal life” for about seventeen (17) times and with about fifteen (15) verses he mentioned zōē-life, that is, “zōē” in Greek translated as “life” in English.
Here are the summary of eternal life teachings in the Gospel of John:
1. God sent the Son so that whoever believes in him will not perish but have eternal life (John 3:15, 16; 6:40, 47).
2. Eternal life is to know the only true God and Jesus Christ whom he has sent (John 17:3).
3. Whoever hears the word of the Son and believes the Father who sent him has eternal life; he does not come into judgment, but has passed from death to life (John 5:24).
4. The Son has the authority over all, to give eternal life to all the Father has given him (John 17:2).
5. The Son has the words of eternal life, the commandments of the Father, and the Scriptures testify about him (John 5:39; 6:68; 12:50).
6. Work for the food that endures to eternal life that the Son gives, his own flesh and blood (John 4:36; 6:27, 54).
7. Drink the water that the Son gives, it will become a spring of water welling up to eternal life (John 4:14).
8. Those who have eternal life will never perish, they can neither be snatched out from the Son’s hand nor the Father’s hand (John 10:28).
9. Those who have eternal life will see life, they will be raised up by the Son at the Last Day (John 3:36; 6:54).
10. Whoever hates their life [psuchē, Gk.] or those who have done good in this world will keep it for eternal life (John 5:29; 12:25).
Assured of eternal life are only those who hear and believe the words of Christ Jesus, the Son that God has sent into the world whom he has given all authority to save it. They have passed from judgment, they will never perish, and they will be resurrected at the last day.
Further readings: Ten Things John Said About Zoe-Life | What does it mean to be Born Again?