"......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 (Acts 1:7-8).
Holy Ghost Power
Jesus promises His disciples power. What kind of power? Holy Ghost Power. That is power not to use for self elevation, but to spread the Gospel of Jesus Christ. We can only do this in the strength and power of the Holy Spirit. It is not by force nor by man's strength, but by the Spirit of the LORD.
We witness for Jesus empowered only by His Holy Spirit