John the Apostle
John 17:3BSB·traditional attribution

Now this is eternal life, that they may know You, the only true God, and Jesus Christ, whom You have sent.

John Calvin Reformed @genevareformer

3. And this is eternal life He now describes the manner of bestowing life, namely, when he enlightens the elect in the true knowledge of God; for he does not now speak of the enjoyment of life which we hope for, but only of the manner in which men obtain life And that this verse may be fully understood, we ought first to know that...

Matthew Henry Presbyterian @wholebiblehenry

Here we have, I. The circumstances of this prayer, Joh 17:1. Many a solemn prayer Christ made in the days of his flesh (sometimes he continued all night in prayer), but none of his prayers are recorded so fully as this. Observe, 1.

Commenting on John 17:1-5

John Gill Reformed Baptist @doctorgill

And this is life eternal,.... That is, the beginning and pledge of it, the way unto it, and means of it, and what will certainly issue in it: that they might know thee, the only true God, and Jesus Christ, whom thou hast sent.