Book excerpt: Who is the 'Devil'? And what is he due? The Devil is anyone who disagrees with you. And what he is due is the right to speak his mind. He must have this for your own safety's sake because his freedom is inextricably tied to your own. If he can be censored, why shouldn't you be censored? If we put barriers up to silence 'unpleasant' ideas, what's to stop the silencing of any discussion? This book is a full-throated defense of free speech and open inquiry in politics, science, and culture by the New York Times bestselling author and skeptic Michael Shermer. The new collection of essays and articles takes the Devil by the horns by tackling five key themes: free thought and free speech, politics and society, scientific humanism, religion, and the ideas of controversial intellectuals. For our own sake, we must give the Devil his due.