John Chrysostom, on Acts 1:8

“But you shall receive the power of the Holy Ghost coming upon you, and you shall be witnesses unto me in Jerusalem, and in all Judea, and Samaria, and even to the uttermost part of the earth.”

“"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.”

Imported from an open dataset — not yet checked against the printed edition.