To them it was revealed, that not to themselves, but to you, did they minister these things, which now have been announced to you through those who preached the Gospel to you by the Holy Spirit sent out from heaven; which things angels desire to look into.

 This passage tells us not only of the visions of the prophets but also of the message of the preacher. It was the preachers who brought the message of salvation to the readers of Peter's letter. 