Theophylact of Bulgaria
They searched into the future, as Daniel did, whom the angel appearing to him called a man of desires for this reason (Dan 10:11).
They investigated what time, and what kind of time, the Spirit who was in them was indicating. “What time” means the time of fulfillment.
“What kind” means when the Jews, through various captivities, would come to perfect worship of God and become capable of receiving the mystery of Christ.
Notice that by calling the Spirit the Spirit of Christ, the Apostle confesses Christ as God.
If both the Apostles and the prophets acted by the Holy Spirit, the one proclaiming prophecies and the other the Gospel, then obviously there is no difference between them.
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Therefore, says the Apostle, you must have the same attention toward us that their contemporaries had toward the prophets, lest you be subject to the punishment that befell those disobedient to the prophets.
It must also be observed that in these words the Apostle Peter reveals the mystery of the Trinity.
When he said “the Spirit of Christ,” he indicated the Son and the Spirit. He indicated the Father when he said “from heaven.”
For “from heaven” should be understood not of place, but chiefly of God, who sends the Son and the Spirit into the world.