Acts 1:8

But 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, and unto the uttermost part of the earth.

When Jesus referred to the nearness of the great revelation of the Spirit's gifts, the disciples, whose hopes of some form of temporal kingdom under the leadership of Christ had been revealed since His resurrection, thought that He was referring to this blissful consummation of their hopes. Those that had come together therefore, most likely in Jerusalem, put the question to the Lord: At this time wilt Thou restore the kingdom unto Israel? Their minds had returned entirely to the earthly, carnal understanding. They understood the prophecies of old as well as the promises of the Lord of the restoration of the kingdom to Israel, to be accomplished by the utter annihilation of the enemies of God and the complete victory for the Jews. Their foolish thoughts were not effectually dispelled until the Spirit of Pentecost was shed forth upon them. Although the question of the disciples had been put in all sincerity and sobriety, it argued for a remarkable lack of proper understanding after all the patient teaching of Jesus. His answer, therefore, in a way is a reproof. For He refers them to the real Messianic kingdom, to the future Kingdom of Glory, which will see the full revelation of Christ's majesty before the eyes of all men, very comforting to those that are to partake of this bliss with their Redeemer. Jesus here guards the royal prerogative, the exclusive rights of the Father. It is not the business of the disciples to know the times and the seasons, critical and otherwise, which are controlled by the exclusive authority and power of the Father. That most critical time and hour above all, which will decide the fate of mankind, is not theirs to inquire for. Note: Whatever pertains to the revelation of God's majesty should not be a subject of anxious thought for the Christians: both the government of the world and the Church and the revelation of the future glory are in His hands, to be revealed at His time. Jesus rather reminds the apostles that they will receive, will be given power, strength, which they should exert and put forth in the great duties of their calling. This power would be imparted to them when the Holy Ghost would come down upon them. The power to be effective witnesses for Christ is evidently meant. Filled with this strength from above, the disciples should bear witness, should tell what they had seen and heard of Christ, whose message they were to proclaim and who was to be the content of their message. In Jerusalem their work was to begin, but not to be confined to that city. In ever-widening circles their influence should extend, by virtue of the power given them through the Holy Ghost, throughout Judea, Samaria, and to the end of the world. There is neither limit nor boundary to the Gospel of Jesus Christ. Note: The believers to this day have the same call and the same promise, but must observe also the same command, to be witnesses of Christ, of His salvation, to the uttermost parts of the earth.