From Fresh Expressions:
One may bristle at the thought of experimenting in ministry, as it defies the certainty we so often want to bring into new efforts. New effort means new investments of every sort. When faced with the prospect of generating new or redirecting existing resources towards new ministry efforts the risk of failure, for many, is too costly unless we approach the endeavor with a degree of certainty that it will “work.”
The problem is certainty is an illusion.