John the Apostle
John 14:17BSB·traditional attribution

the Spirit of truth. The world cannot receive Him, because it neither sees Him nor knows Him. But you do know Him, for He abides with you and will be in you.

John Calvin Reformed @genevareformer

17. The Spirit of truth. Christ bestows on the Spirit another title, namely, that he is the Master or Teacher of truth. “A scavoir qu’il est Maistre ou Docteur de la verite.” Hence it follows, that until we have been inwardly instructed by him, the understandings of all of us are seized with vanity and falsehood. Whom the world cannot receive.

Matthew Henry Presbyterian @wholebiblehenry

Christ not only proposes such things to them as were the matter of their comfort, but here promises to send the Spirit, whose office it should be to be their Comforter, to impress these things upon them. I. He premises to this a memento of duty (Joh 14:15): If you love me, keep my commandments.

Commenting on John 14:15-17

John Gill Reformed Baptist @doctorgill

Even the Spirit of truth, whom the world cannot receive,.... These words explain who is meant by the Comforter, "even the Spirit of truth"; the true Spirit of God, the dictator of the Scriptures of truth, who leads men into the truths of the Gospel, confirms them in them, and gives boldness and freedom to own, and confess them before men: whom the world cannot...