Acts 1:8

“And so, when the Lord appointed his servants the apostles, that we might recognize that the creature was one thing and the grace of the Spirit another, he appointed them to different places, because all could not be everywhere at once. But he gave the Holy Spirit to all, to shed upon the apostles though separated the gift of indivisible grace. The persons, then, were different, but the accomplishment of the working was in all one, because the Holy Spirit is one of whom it is said, "You shall receive power, even the Holy Spirit coming upon you, and you shall be witnesses to me in Jerusalem and in all Judea and Samaria, and to the ends of the earth."The Holy Spirit, then, is uncircumscribed and infinite, who infused himself into the minds of the disciples throughout the separate divisions of distant regions and the remote bounds of the whole world whom nothing is able to escape or to deceive. And therefore holy David says, "Where shall I go from your Spirit, or where shall I flee from your face?" Of what angel does the Scripture say this, of what dominion, of what power, of what angel do we find the power diffused over many? For angels were sent to few, but the Holy Spirit was poured upon whole peoples. Who, then, can doubt that that is divine which is shed upon many at once and is not seen; but that that is corporeal which is seen and held by individuals?”

“And they did become witnesses by their miracles. This is so, for the grace of the Spirit is ineffable, and innumerable are his gifts. Moreover, this took place that you might learn that the gifts and the power of the Father and of the Son and of the Holy Spirit are one. What appears to be proper to the Father also belongs in reality to the Son and to the Holy Spirit. "How is it, then," you will say, "that no one comes to the Son 'unless the Father draw him'?" But this is shown to be true of the Son also, for he said, "I am the way; no one comes to the Father but through me." And notice that the same thing is true of the Spirit also. For "No one can say, 'Jesus Christ is Lord,' except in the Holy Spirit." And again, we are told that apostles have been given to the church, at one time by the Father, at another by the Son, and at another by the Holy Spirit, so we see that the varieties of gifts belong to the Father and to the Son and to the Holy Spirit.”

“"But ye shall receive power, after that the Holy Ghost is come upon you." As in the former instance He had not answered their question (for it is the part of a teacher to teach not what the disciple chooses, but what is expedient for him to learn), so in this, He tells them beforehand, for this reason, what they ought to know, that they may not be troubled. In truth, they were yet weak. But to inspire them with confidence, He raised up their souls, and concealed what was grievous. Since he was about to leave them very shortly, therefore in this discourse He says nothing painful. But how? He extols as great the things which would be painful: all but saying, "Fear not: for ye shall receive power, after that the Holy Ghost is come upon you; and ye shall be witnesses unto Me both in Jerusalem, and in all Judea, and in Samaria." For since he had said, "Go not into the way of the Gentiles, and into any city of the Samaritans enter ye not" (Matt. x. 5), what there He left unsaid, He here adds "And to the uttermost part of the earth;" and having spoken this, which was more fearful than all the rest, then that they may not again question Him, He held His peace.”

“But you shall receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem, etc. When the Holy Spirit comes upon you, he says, it will not bring the kingdom of Israel, or the kingdom of God in Israel, as you suppose, but will provide you with the power to testify about me. And so far off are the times of that kingdom, that first not only this city of Jerusalem, but also all the borders of Judea, and then even the nearby region of Samaria, will be spread by the fame of the Gospel to the ends of the world.”

“Why then did Christ not answer what the disciples were asking, but said: "you shall receive power"? In answer to them He said: "it is not for you to know," and only then added: "but you shall receive power." These words explain in a certain way the descent and, so to speak, the outpouring of the Holy Spirit. Here it is necessary to mention the Phrygian heresy, which held that the Spirit the Comforter was sent two hundred years after the ascension of Christ upon women considered to be prophetesses, Priscilla and Maximilla, and upon Montanus, who was infected with the same madness as they; then, they say, the promise was fulfilled: "I will send" the Comforter "unto you" (John 16:7). — But why does He declare to them that which they did not ask about, namely: "you shall receive power"? Because He is the Teacher; and it is the calling of a teacher to teach not what the student wants, but what is profitable to know. Since before He had said: "Do not go on the path to the Gentiles, and do not enter a city of the Samaritans" (Matt. 10:5), wishing that the word of God be preached first to the Jews, and now it was to spread throughout the entire world, He fittingly adds "in all Judea and Samaria and even to the end of the earth." The saying "you shall be My witnesses" is both an exhortation and an immutable prophecy, because they bore witness to their preaching to the uttermost ends of the earth.”

“Since before this he commanded: Do not go on the way of the Gentiles (Matt. 10:5), and the following things: for he was sent only to the lost sheep of Israel; now with these, the preaching is shared also with the Samaritans and the other nations. At the same time, Jesus foretells that the word of holiness will be preached throughout the whole world. For what else does "to the ends of the earth" signify?”