The power for evangelism
Please notice the words of our Lord
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 Judaea, and in Samaria, and unto the uttermost part of the earth.
Luke 24:49 And behold, I send the promise of my Father upon you: but tarry ye in the city of Jerusalem, until ye be endued with power from on high.
Evangelizing the lost will never be accomplished by man's personal abilities, talents, wisdom, or programs.
Peter was a complete failure in following and serving Christ by his own strength, until the day of Pentecost. Upon receiving the Holy Spirit, he became a totally different person.
Throughout the scriptures God's plan was always fulfilled by the Holy Spirit empowering and working through people.