And this is life eternal, that they might know Thee the only true God, and Jesus Christ, whom Thou hast sent.~ John 17:

In other words, Jesus is saying that this is what life and true living is all about: to recognize & receive the one true Creator God, and Jesus Christ the Incarnate God and Savior of the world that the Father has sent into the world for that purpose. Eternal life is received and possessed by the person who knows that, and lives his life promoting that truth.