Remember, after all the training Jesus had done with the disciples, he instructed them to be still, to wait in Jerusalem for the Holy Ghost. They were not to begin their ministry without Jesus until they were filled to overflowing with the power and presence of the Holy Ghost. Once this happened they would minister with every task enhanced, every memory provoked, every encounter perfected by the Holy Ghost, their helper. He gave them the appropriate responses for the people they encountered once they began.
“Silver and gold have I none, but such as I have I give unto thee: In the name of Jesus Christ of Nazareth, rise up and walk,” to the lame man at the temple gate in Acts 3.
“Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved,” to the high priest and council who threatened to silence them in Acts 4.
The Holy Ghost so powered their prayers that when they were finished, “the place was shaken where they were assembled together: and they were all filled with the Holy Ghost, and they spoke the word of God with boldness,” at the end of Acts 4.
Have you heard of the Holy Ghost?