“And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.”
King James Version (KJV)
17:3 To know - By loving, holy faith, thee the only true God - The only cause and end of all things; not excluding the Son and the Holy Ghost, no more than the Father is excluded from being Lord, #1Cor 8:6|; but the false gods of the heathens; and Jesus Christ - As their prophet, priest, and king: this is life eternal - It is both the way to, and the essence of, everlasting happiness.
Joh 17:3 This life is eternal, that they might know thee, etc. The knowledge of God as manifested in Jesus Christ is the first requisite to salvation and life eternal. They key to that knowledge is faith and love.