It never came simply because a prophet wanted it to. Instead, the Holy Spirit guided the prophets as they spoke. Although the prophets were human, what they said came from God.
The Spirit of Christ in them was telling about the sufferings of the Messiah and the glory that would follow. They wanted to find out when and how this salvation would come.
When I heard this, I fell at his feet to worship him. But he said to me, “Don’t do that! I’m God’s servant, just like you and your brothers and sisters who hold firmly to what Jesus taught. Worship God! The Spirit of prophecy tells the truth about Jesus.”
They disagreed with one another, and they began to leave after Paul made a final statement. He said, “The Holy Spirit was right when he said to your people long ago through Isaiah the prophet,