I don't understand your point concerning 1 Peter chapter one. This secret concerning the body of Christ was hidden in God, and this is why the prophets who spoke and wrote God’s Word had to search diligently to find out the length of time that was between “the sufferings of Christ, and the glory.” They could not find anything to tell them if the glory would follow the sufferings immediately, or if there would be a period of time between them. The prophets revealed “the sufferings” and saw the glory that followed, but they did not know “what” it was or the length of time between “the sufferings” and the appearing of Christ, and that is what those prophets searched diligently to find.
The prophets spoke by the Spirit of Christ; The Spirit of Jesus Christ, The Spirit of the LORD God.
- the Spirit of Christ who was in them
Whenever you see a Prophet saying, "thus says the LORD", it was Christ in Them the Spirit of the LORD Jesus Christ, YHWH.
Thus says the LORD, your Redeemer, The Holy One of Israel:
“For your sake I will send to Babylon, And bring them all down as fugitives—
The Chaldeans, who rejoice in their ships.
I am the LORD, your Holy One,
The Creator of Israel, your King.”
Isaiah 43:14-15
He is the LORD, YHWH the LORD God who became flesh.