John 16:13

13. Guide you into all truth A strict translation would require the article the before the word truth. The Spirit does not guide into scientific, political, or historical truth. The inspiration of Scripture was never intended to teach astronomy or geology. It was to guide them into all the truth, namely, the truth embraced in their apostolate. And this is the truth beyond all comparison with any other truth.

Not speak of himself Literally, from himself. The messenger-Spirit should not have a message of his own separate and apart from his divine Sender. Like the Son, he is not alone and independent, absolutely originating his own doctrine.

Whatsoever he shall hear… shall he speak This hearing, be it noted, is a hearing by the Spirit; it has no fleshly ear, no atmospheric sound. But spirits, we understand, communicate, though by pure voiceless impartation; and so the divine Spirit hears without organ; that is, perfectly sympathizes in the divine thought and purpose of Father and Son, from whom He goes forth. Thus, in an ineffable and mysterious sympathy and oneness does the holy Trinity eternally agree. Here let us believe rather than explain.

He will show you things As it is a spiritual and not a fleshly tongue with which the Spirit will speak, and a spiritual ear with which he will hear, so it is with a purely spiritual, not a fleshly hand, that he will show. He will take the apparatus of salvation, the cross, the tomb, the glory, and unfold them all to the eye of the human spirit.

Things to come Not only these past things, but things future will he show. The future growth of his Church, the future advent, the future salvation of the blessed, and the future retributions of eternity, will be so unfolded by the Spirit to them that they can unfold the whole to the world.