In Mark 16 when Jesus gave us the Great Commission to go into all the world and preach the Gospel he didn't just mean pastors, leaders, or evangelist.  Jesus meant believers. In verse 17 he told us that signs would follow the believers.  Notice the word "FOLLOW" in that verse. That means that the believer has to be going for the signs to follow. We have to be going out to give the Word, we have to be laying hands on the sick, we have to be setting people free.  Do you realize that this was a command from Jesus to his disciples, not a suggestion and it was the last instructions that he gave to them.  It was his final words before he was received up into heaven.  So those were words of importance to help the disciples to reach the known world with the Gospel at that time.  Read verse 20 to see what happened.  It says "And they went forth and preached every where, the Lord working with them, and confirming the word with signs following".  When we are obedient to "GO FORTH" the FATHER, SON AND THE HOLY GHOST are with us to confirm the Word and to bring signs!  Together we are a team reaching the WORLD with the Gospel!