When Jesus rose from the dead and commissioned His followers to carry on His mission discipling the world - everyone knew it was impossible. To even try would be catastrophic. And that's why Jesus said, "Wait! Wait for the Holy Spirit to come on you." So, they did... and He did... and that day, Pentecost, jumpstarted what we now know as the Church - a growing community filled with, driven by, and strategically organized by the Holy Spirit. At first, this just looked like a bunch of crazy people - maybe drunk. But they weren't.
Without status, without money, without political position, without weapons - without anything, really, except for the power of the Holy Spirit - they changed the world!