I think I have discovered one of the most effective motivation tools for evangelism. It also seems to be the way that Jesus did it. Tell people to "tell no one" and they will not be able to shut their mouth. Isn't it ironic that in Mark he continously tells people to "tell no one" about what He has done and they cannot seem to keep silent. But, Jesus has done something even greater with us by giving us new life and we cannot muster the courage to tell anyone.
What a sharp rebuke this is to my paltry evangelism:
"But the more he charged them, the more zealously they proclaimed it." (Mark 7:36)