John Chrysostom
You are seeking too much, He says, though they already knew what was far more important. So that you may understand this exactly, see how many things I shall enumerate. Tell me, what is more important than what had been revealed to them? They learned that Christ is the Son of God, and that God has a Son equal in honor. They learned that there will be a resurrection. They learned that Christ ascended and sat down at the right hand of the Father. They also learned what is still more wondrous: that flesh sits on high and is worshiped by angels. They learned that the Lord will come again to judge the whole world, and that then they too will sit as judges of the twelve tribes of Israel.
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They learned that the Jews were rejected, and that the Gentiles would enter the Kingdom of God instead of them. To know that this will be is a great thing. But to grasp that someone will reign, or when he will reign, is nothing great. Paul learned what "man may not utter" (2 Cor 12:4). He learned all that preceded this world. Which is harder to know, the beginning or the end? Obviously, the beginning. Moses learned this and, by counting the years, shows when it was and how long ago. Solomon also knew this, and therefore said, "I will not forget to recount the things from eternity" (Prov 8:21). Therefore the apostles later learned that the time was near, as Paul also says, "The Lord is near. Be anxious for nothing" (Phil 4:5-6). But at that time they did not yet know, though signs had been given them. As Christ had said, "not many days from now" (Acts 1:5), but did not mark the time exactly because He wished them to be watchful, so He acts now too. On the other hand, here they do not ask about the end of the world, but about the kingdom. Therefore they said, "Lord, will You at this time restore the kingdom to Israel?" But He did not reveal even this to them. They had also asked Him earlier about the end of the world. Then He answered them with greater severity, so they would not think their deliverance was near, and so He would expose them to dangers. Now He answers not so, but with greater gentleness. And so that His words would not seem offensive to them or merely an evasion, listen to how He immediately promises to give them what would make them rejoice. He added, "But you shall receive power when the Holy Spirit has come upon you. And you shall be My witnesses in Jerusalem and in all Judea and Samaria, and to the end of the earth" (v. 8).