I've been speaking with the likes of Dion and others lately about the prophetic voice. I have been putting it more in context with poverty, homelessness, etc. but I found this quote in an article regarding Detroit's mayor:

"I believe that there comes a time when we as religious leaders have to speak with our prophetic voice, even to powers that be, and say what needs to be said." - the Rev. Edgar Vann, Second Ebenezer Church

Full article at the Free Press here.