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Atomic Bible
John 17:3
Now this is eternal life, that they may know You, the only true God, and Jesus Christ, whom You have sent.
from Prayer for the Son, John 17:1-5
What it says

Eternal life is knowing the only true God and Jesus Christ whom he sent.

What it is doing

Eternal life is defined as knowledge of God and the sent Son.

In context

1When Jesus had spoken these things, He lifted up His eyes to heaven and said, “Father, the hour has come. Glorify Your Son, that Your Son may glorify You. 2For You granted Him authority over all people, so that He may give eternal life to all those You have given Him. 3Now this is eternal life, that they may know You, the only true God, and Jesus Christ, whom You have sent. 4I have glorified You on earth by accomplishing the work You gave Me to do. 5And now, Father, glorify Me in Your presence with the glory I had with You before the world existed.