Life is at the very heart of the Gospel of John. Near the end of the book, John explicitly states that life is the purpose for which the Gospel was written: “These are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name” (John 20:30–31). From beginning to end, John presents life as the great gift that Jesus brings, as the Way, the Truth, and the LIFE.
In John’s Gospel, life refers above all to eternal life. This eternal life is not merely endless existence. Jesus himself defines it in his prayer to the Father: “This is eternal life, that they know you, the only true God, and Jesus Christ whom you have sent” (John 17:3). Eternal life is relational knowledge of the Father and the Son.
The Father fully knows the Son, and the Son fully knows the Father, dwelling forever in perfect communion. Astonishingly, Jesus invites us to share in this divine fellowship. Through him, we are brought into the relationship that the Father and the Son have always enjoyed. This is why Jesus declares, “I came that they may have life, and have it abundantly” (John 10:10). Abundant life is participation in the living relationship of God.
We enter this life through the Spirit. Jesus speaks of the Spirit as “living water” (John 4:10–14), a free gift that becomes within believers “a spring of water welling up to eternal life.” Through the Spirit dwelling within us, we are drawn into the communal knowing of the Father and the Son. In this way, eternal life is truly Trinitarian.