John 16:9

(1.) Of sin (v. 9), because they believe not on me. [1.] The Spirit is sent to convince sinners of sin, not barely to tell them of it; in conviction there is more than this; it is to prove it upon them, and force them to own it, as they (ch. 8 9) that were convicted of their own consciences. Make them to know their abominations. The Spirit convinces of the fact of sin, that we have done so and so; of the fault of sin, that we have done ill in doing so; of the folly of sin, that we have acted against right reason, and our true interest; of the filth of sin, that by it we are become odious to God; of the fountain of sin, the corrupt nature; and lastly, of the fruit of sin, that the end thereof is death. The Spirit demonstrates the depravity and degeneracy of the whole world, that all the world is guilty before God. [2.] The Spirit, in conviction, fastens especially upon the sin of unbelief, their not believing in Christ, First, As the great reigning sin. There was, and is, a world of people, that believe not in Jesus Christ, and they are not sensible that it is their sin. Natural conscience tells them that murder and theft are sin; but it is a supernatural work of the spirit to convince them that it is a sin to suspend their belief of the gospel, and to reject the salvation offered by it. Natural religion, after it has given us its best discoveries and directions, lays and leaves us under this further obligation, that whatever divine revelation shall be made to us at any time, with sufficient evidence to prove it divine, we accept it, and submit to it. This law those transgress who, when God speaketh to us by his Son, refuse him that speaketh; and therefore it is sin. Secondly, As the great ruining sin. Every sin is so in its own nature; no sin is so to them that believe in Christ; so that it is unbelief that damns sinners. It is because of this that they cannot enter into rest, that they cannot escape the wrath of God; it is a sin against the remedy. Thirdly, As that which is at the bottom of all sin; so Calvin takes it. The Spirit shall convince the world that the true reason why sin reigns among them is because they are not by faith united to Christ. Ne putimus vel guttam unam rectitudinis sine Christo nobis inesse—Let us not suppose that, apart from Christ, we have a drop of rectitude.—Calvin.

Verses 7-15 Christ's departure was necessary to the Comforter's coming. Sending the Spirit was to be the fruit of Christ's death, which was his going away. His bodily presence could be only in one place at one time, but his Spirit is every where, in all places, at all times, wherever two or three are gathered together in his name. See here the office of the Spirit, first to reprove, or to convince. Convincing work is the Spirit's work; he can do it effectually, and none but he. It is the method the Holy Spirit takes, first to convince, and then to comfort. The Spirit shall convince the world, of sin; not merely tell them of it. The Spirit convinces of the fact of sin; of the fault of sin; of the folly of sin; of the filth of sin, that by it we are become hateful to God; of the fountain of sin, the corrupt nature; and lastly, of the fruit of sin, that the end thereof is death. The Holy Spirit proves that all the world is guilty before God. He convinces the world of righteousness; that Jesus of Nazareth was Christ the righteous. Also, of Christ's righteousness, imparted to us for justification and salvation. He will show them where it is to be had, and how they may be accepted as righteous in God's sight. Christ's ascension proves the ransom was accepted, and the righteousness finished, through which believers were to be justified. Of judgment, because the prince of this world is judged. All will be well, when his power is broken, who made all the mischief. As Satan is subdued by Christ, this gives us confidence, for no other power can stand before him. And of the day of judgment. The coming of the Spirit would be of unspeakable advantage to the disciples. The Holy Spirit is our Guide, not only to show us the way, but to go with us by continued aids and influences. To be…