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.
So John says the following in chapter 17 in verse 3:
And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.
John 17:3 (KJV)
John says: This is eternal life that they know you, but who should people know? This is Jesus, the chosen one from God, in whom God was pleased and sent Him so that we can know eternal life.
Jesus brought us the message of eternal life, of all things reserved for all those who confess that Jesus is Lord and Savior and who remain faithful in the truth. Jesus is eternal life.