John Stuart Mill (1806–1873) penned the most powerful and winsome defense of the freedom of speech, but it is not without its presuppositions. Those assumptions have eroded in our culture, which means the freedom of speech is eroding, too. Are human beings mouthpieces of power and prejudice, or is the truth a valuable common ground from which we can evaluate each other’s ideas? Mill concludes that censorship is hubris and indoctrination is cowardice.