Joh:17:3: And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.
The eternal life is to know the eternal (God who is beyond beginning and End), when someone can know, who is He (God), through His spoken words (because the words which he said are life/eternal and Spirit), but the question is how they can realize it, they have been given an eternal life, here is something which need to know. This only can happened when someone have the same mind like eternal existed one.
Now, how can someone get that mind or wisdom so that they can think/act/understand/see like an eternal one.
Joh:3:16: For God so loved the world,
that he gave HIS ONLY BEGOTTEN SON,(Christ)
BELIEVETH (through faith)
in him ( on His son)
should not perish,
EVERLASTING LIFE.(can have eternal life)
The key of having eternal life is faith, the faith on the Son of God Christ.
Ro:6:22: But now
servants to God,
Ro:6:23: For the wages of sin is death;
but the gift of God
Jesus Christ our Lord.
When someone believes on Son of God and His holy sacrifice (Calvary) and keep faith on this sacrifice. Then they are given His understanding through faith, this understanding is called Holy Ghost(Mind of Christ). This can happen only through faith.
1Jo:5:20: And we know that the Son of God is come, and HATH GIVEN US AN UNDERSTANDING, that we may KNOW HIM THAT IS TRUE, and WE ARE IN HIM that is true, even IN HIS Son Jesus Christ. THIS IS THE TRUE GOD, AND ETERNAL LIFE.
When someone receives the Son(Christ/Holy Spirit/ understanding) then they become aware about everything and can act like an eternal being, because they don’t see the flesh only but can see the spirit behind everybody’s act and starts to enjoy the eternal life.
Jude:1:21: Keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life.
Means to be humble and looking for mercy so that He can give us eternal life, God comes to those who seek him with their Heart and humble themself, not being praised, but only to meet Him(God)