1 Peter 1:10-12 "As to this salvation, the prophets who prophesied of the grace that would come to you made careful searches and inquiries, 11 seeking to know what person or time the Spirit of Christ within them was indicating as He predicted the sufferings of Christ and the glories to follow. 12 It was revealed to them that they were not serving themselves, but you, in these things which now have been announced to you through those who preached the gospel to you by the Holy Spirit sent from heaven—things into which angels long to look."
Preaching is not man's method of delivering the Gospel, but God's. Consider Romans 10:14-15 "How then will they call on Him in whom they have not believed? How will they believe in Him whom they have not heard? And how will they hear without a preacher? (15) How will they preach unless they are sent? Just as it is written, “How beautiful are the feet of those who bring good news of good things!” Preaching is the means of delivering the Gospel, with the scripture being the ground of the Gospel. The Holy Spirit empowering the preaching is the Supreme Evangelist. Unless the Spirit attends the preaching of the Word, the preacher is no more effective than a glove without a hand. The scripture's power to save is unquestioned. The preacher is ever in dependence upon the Spirit speaking through those words.
So what can be said about the manner in which God unfolded the Gospel of salvation in His word? First, the Gospel is revealed in progression (1 Peter 1:10-11a). Second, the Gospel revolves around the Person of Christ (1 Peter 1:11). Then finally, the Gospel remains to be preached. (1 Peter 1:12)