John 16:13 But when He, the Spirit of reality comes, He will guide you into all the reality; for He will not speak from Himself, but what He hears He will speak; and He will declare to you the things which are coming.
The work of the Spirit is, first, to convict the world. Second, as the Spirit of reality He guides the believers into all the reality; that is, He makes all that the Son is and has real to the believers. All that the Father is and has is embodied in the Son (Col. 2:9), and all that the Son is and has is declared as reality to the believers through the Spirit (vv. 14-15). This declaring is the glorifying of the Son with the Father. Hence, it is a matter of the Triune God being wrought into and mingled with the believers. Third, the Spirit declares the things that are to come, which are revealed mainly in Revelation (Rev. 1:1, 19). The three aspects of the Spirit’s work correspond with the three sections of John’s writings: his Gospel, his Epistles, and his Revelation. (John 16:13, footnote 1, Recovery Version)