Numbers 16:28 And Moses said, Hereby ye shall know that the LORD hath sent me to do all these works; for I have not done them of mine own mind.
There must be something about our ministry that says God sent me. Things must happen that are beyond our power and ability: they will not allow you to train them unless they see the hand of God on your life. What is there about you and your ministry that can only be explained by supernatural power.
By the way, I always wonder the same thing about my ministry!