Prophecy glorifies God as he reveals himself and his character to all creation through his speaking (his voice). As God speaks he testifies of the Truth. The Truth is Jesus Christ.
“6 Jesus said to him, “I am the way, and the truth, and the life. No one comes to the Father except through me.” – John 14:6
This is why the testimony of Jesus is the spirit of prophecy. (Revelation 19:10) In all things our Triune God is declaring the truth of his glory in the person and work of Jesus Christ, God the Son, that he might be made preeminent.
15 He is the image of the invisible God, the firstborn of all creation. 16 For by him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things were created through him and for him. 17 And he is before all things, and in him all things hold together. 18 And he is the head of the body, the church. He is the beginning, the firstborn from the dead, that in everything he might be preeminent. 19 For in him all the fullness of God was pleased to dwell, 20 and through him to reconcile to himself all things, whether on earth or in heaven, making peace by the blood of his cross. – Colossians 1:15-20
If Christ is being made preeminent in all things it is through the work of the cross that our Father has chosen to grant him preeminence.
Nowhere is the glory of God, his very character, more clearly displayed than in the cross work of Christ. For this reason, it is of the utmost importance to God. In the cross of Christ we see God’s character on full display. We see his Holiness and justice as the Father rightly deals with sin, we see his power as the Holy Spirit sustains Christ to fully absorb the weight of sin and finally we see his love as the Son, Jesus empties himself on the cross. 1 John 4:8 tells us that “…God is love” and here, in the cross of Christ, is where we most clearly see this truth. God’s selfless “agape” love, his perfect love, is made manifest in his Triune character via the cross of Jesus Christ.
Father
42 saying, “Father, if you are willing, remove this cup from me. Nevertheless, not my will, but yours, be done.” – Luke 22:42
Son
7 but emptied himself, by taking the form of a servant,[a] being born in the likeness of men. 8 And being found in human form, he humbled himself by becoming obedient to the point of death, even death on a cross. 9 Therefore God has highly exalted him and bestowed on him the name that is above every name, – Philippians 2:7-9
Holy Spirit
14 how much more will the blood of Christ, who through the eternal Spirit offered himself without blemish to God, purify our[a] conscience from dead works to serve the living God. – Hebrews 9:14
In the cross of Christ we see the Father, the Son and the Spirit all acting in perfect Triune selfless love. It is this love, perfect love, that sets Holy God apart from everything in creation. The cross is God’s selfless love perfected.
10 For it was fitting that he, for whom and by whom all things exist, in bringing many sons to glory, should make the founder of their salvation perfect through suffering. – Hebrews 2:10
So it can be said, prophecy glorifies God as it reveals his loving character by preaching Christ crucified.
Next: How Does Prophecy Work?
Prophetic Word of God 