Patristic Wisdom: Looking to Pentecost

But Peter, standing up with the eleven, raised his voice and said to them, “Men of Judea and all who dwell in Jerusalem, let this be known to you, and heed my words. For these are not drunk, as you suppose, since it is only the third hour of the day. But this is what was spoken by the prophet Joel:

‘And it shall come to pass in the last days, says God,
That I will pour out of My Spirit on all flesh;
Your sons and your daughters shall prophesy,
Your young men shall see visions,
Your old men shall dream dreams.
And on My menservants and on My maidservants
I will pour out My Spirit in those days;
And they shall prophesy.
I will show wonders in heaven above
And signs in the earth beneath:
Blood and fire and vapor of smoke.
The sun shall be turned into darkness,
And the moon into blood,
Before the coming of the great and awesome day of the Lord.
And it shall come to pass
That whoever calls on the name of the Lord
Shall be saved.’” (Acts 2:14–21)

Nowhere as yet the name of Christ, nor His promises but the promise is that of the Father. Observe the wisdom: observe the considerate forbearance. He did not pass on to speak at once of the things relating to Christ; that He had promised this after His Crucifixion; truly that would have been to upset all. And yet, you will say, here was sufficient to prove His divinity. True, it was, if believed (and the very point was that it should be believed); but if not believed, it would have caused them to be stoned. And I will pour out of My Spirit upon all flesh. He offers even to them excellent hopes, if they would have them.… Then he goes on with the prophecy, which has in it also something terrible. And I will show wonders in heaven above, and signs. In these words he speaks both of the judgment to come, and of the taking of Jerusalem. Blood and fire, and vapor of smoke. Observe how he describes the capture. The sun shall be turned into darkness, and the moon into blood. This results from the internal affection of the sufferers. It is said, indeed, that many such phenomena actually did occur in the sky, as Josephus attests. At the same time the Apostle strikes fear into them, by reminding them of the darkness which had lately occurred, and leading them to expect things to come. Before that great and notable day of the Lord come. For be not confident, he means to say, because at present you sin with impunity. For these things are the prelude of a certain great and dreadful day. Do you see how he made their souls to quake and melt within them, and turned their laughter into pleading for acquittal? For if these things are the prelude of that day, it follows that the extreme of danger is impending. But what next? He again lets them take breath, adding, And it shall come to pass, that whosoever shall call upon the name of the Lord, shall be saved. This is said concerning Christ, as Paul affirms, but Peter does not venture as yet to reveal this.

John Chrysostom, Homilies on the Acts of the Apostles 5