Jesus was sent to the world so that the world would know the giver of eternal life, what is eternal life? For this is eternal life: the one who was sent by our heavenly Father so that we can be free from sin and death, so that through Jesus we can achieve our salvation.
This is eternal life, that we can know Jesus, since He is the bearer of it, that we can abide firm until that great promise of the Father is delivered to us, that that special day we can go to Him or He come to us , but above all, that we can be firm.
In the book of John, we find this man talking about eternal life, the one who possesses it and who brought it to us: Jesus the son of God, this was the chosen one of our God for the salvation of each one of His children.