It seems like the things that become extremely popular are the first things that people attempt to fake. It can be hard to know the difference at times between the real deal and a serious imitation. Whether it's purses or NBA Jerseys people all over the world spend their time making fakes in order to profit financially. The false prophets at Corinth had done the very same things by imitating a real apostle. 

I.   The Real Apostles had unique qualifications and power. vs 12

II.  A Real pastor is willing to endure and sacrifice. vs 12-16 

III. A Real pastor practices Honesty. vs 16-18

IV. A Real pastor reverently edifies God's people vs 19