"But you shall receive power (ability, efficiency, and might) when the Holy Spirit has come upon you, and you shall be My witnesses in Jerusalem and all Judea and Samaria and to the ends (the very bounds) of the earth." (Acts 1:8 AMP)
The work of the Lord is done not primarily by human effort
or ingenuity -- although God uses these -- but by the power of His Spirit.
Those who wish to rise above the status of the Lord's assistants by
establishing their own empires and demanding allegiance to themselves will not
accomplish the Lord's work. Those who endeavor to succeed without the resources
of the Spirit will be doomed to fail. But those who humbly, joyfully, and
willingly make themselves available to the Lord for all that He has in mind and
who keep their lives open to the full flow of His Spirit's power will assist
the Lord's work to its glorious consummation.
-- Stuart Briscoe in Daily Study Bible for Men