I found this little clip on the Together For the Gospel website. It is a great reminder for what is at stake in preaching. There is an earnestness that should be present in preaching because God killed his Son to pay his wrath for our sin. So when a preacher tells jokes or plays psycologist, or uses the pulpit for casual conversations he is making a mockery of what God has done for us. God sacrificed his son as an atonement for us. How dare we approach the gospel so lightly. And John Piper is the best prophet in our time to remind us of the call of the preacher.
Sorry about the fact that the sound is one or two seconds off. I had problems uploading it and now it has disappeared from the T4G website so I can't fix it.