THE TRUTH GIVING SPIRIT!

Joh 16:13  But when He, the Spirit of Truth (the Truth-giving Spirit) comes, He will guide you into all the Truth (the whole, full Truth). For He will not speak His own message [on His own authority]; but He will tell whatever He hears [from the Father; He will give the message that has been given to Him], and He will announce and declare to you the things that are to come [that will happen in the future].

When he is come - It is universally allowed that the Father, Son, and Holy Ghost dwell in all believers. And the internal agency of the Holy Ghost is generally admitted. That of the Father and the Son, as represented in this Gospel, deserves our deepest consideration. 

The Spirit of truth - So called because HE would teach them all necessary truth. 

John 16:13

When the Spirit of truth is come,.... Of this character of the Spirit, 

(see below:Joh 14:17.) His coming, as before, intends more especially His descent on the apostles at Pentecost; though what is here said of Him is true of His office, and of His operations on other persons, and at other times:

He will guide you into all truth; necessary to be known, useful to men, profitable to the churches, even the whole counsel of God; what relates to worship, the nature, form, and spirituality of it, as well as doctrine. 

He is as a guide, he goes before, leads the way, removes obstructions, opens the understanding, makes things plain and clear, teaches to profit, and leads in the way men should go, without turning to the right hand or left, which, without such a guide, they would be apt to do. 

The Jews (y) have a notion of the Holy Ghost being a guide into all wisdom and knowledge.

"R. Phinehas says, the Holy Spirit rested upon Joseph from his youth to the day of his death, and "guided him into all wisdom", as a shepherd leads his flock, according to Psa 80:1;''

For He shall not speak of Himself: as Christ, the Son, spoke not of himself in opposition to the Father, so the Spirit speaks not of himself in opposition either to the Father, or the Son, but in perfect agreement with both; being, as of the same nature and essence, power and glory, so of the same mind, understanding, and will; and as they agreed and wrought jointly and harmoniously, in the works of nature and providence, so in the economy of grace and salvation.

But whatsoever He shall hear, that shall He speak; as Christ himself did, Joh 15:15; and they are such things as ear has not heard besides; what were secretly transacted in the council and covenant of peace, and agreed upon by all the three persons; things which concern the salvation of men, the Gospel church state, another world, and the glory of all the divine persons:

and He will show you things to come; which would come to pass after the death, resurrection, and ascension of Christ; things relating to the state and settlement of the Gospel church, the partition wall being broken down, the law of commandments contained in ordinances abolished, and a new face of things appearing in the kingdom and interest of Christ, in consequence of the Spirit being sent forth, and poured down: or this may respect the spirit of prophecy in the apostles, who showed to them many things to come in after ages; as the rise of the man of sin, the great departure from the faith, and decline of the power of godliness in the last days, the calling of the Jews, the destruction of antichrist, the burning of the world, and the making of new heavens and new earth; and, in short, what would be the state of the church of Christ, and religion, in all the several periods of time, quite down to the coming of Christ, when dead saints shall be raised, and living ones changed, as is declared throughout the book of Revelation.

John 14:17   

17  The Spirit of Truth, Whom the world cannot receive (welcome, take to its heart), because it does not see Him or know and recognize Him. But you know and recognize Him, for He lives with you [constantly] and will be in you.