"The 'old man' in each of us--to use Paul's language--continually tempts us to value or build our churches on other things, things we can see and measure. We want to rely on marketing research, personal charisma, good music, or other natural devices. Now, I'm not saying that 'natural' devices are bad, per se. But if we're relying upon them, there's no difference between us and the world. God means to challenge us right here. 'Is not my word like fire' he would say to us, 'and like a hammer that breaks the rock in pieces.' (Jer. 23:29)...
The power of God's Word is a faith proposition. It takes faith to believe that invisible words and the invisible Spirit could give life to a valley of dry bones. By comparison, it takes absolutely no faith to believe in the power of beauty, intelligence, strength, style, or humor. These qualities are attractive, and we can literally watch them draw a crowd. We can watch them build a 'church.'"
Pastors, Don't Listen to the 'Old Man'
From Jonathan Leeman's Reverberation: How God's Word Brings Light, Freedom, and Action To His People: