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.
Peter’s point in 1 Peter 1:10-12 seems to be that his readers could rejoice in their sufferings even though they could not see exactly how or when their present trials would end. The readers should find encouragement by looking at the prophets’ limited understanding of their own prophecies dealing with the suffering and glorification of Messiah. God would bring their own experiences to a glorious completion just as He would Messiah’s, though in both cases the details of fulfillment were not yet clear.