J. K. Rowling, Harry Potter and the Deathly Hallows, p. 334 (London : Bloomsbury, 2007)
Polite opposition did not abolish slavery. It took arguments, campaigns and fearless outspoken criticism of the system and its fortifications. Freeing the human mind from the enslavement of superstition and religion requires the same approach. As Frederick Douglass said:
Those who profess to favour freedom and yet depreciate agitation, are people who want crops without ploughing the ground; they want rain without thunder and lightning; they want the ocean without the roar of its many waters. The struggle may be a moral one, or it may be a physical one, or it may be both. But it must be a struggle.
A. C. Grayling, The God Argument : The Case against Religion and for Humanism
h/t The Skeptinaut @ WEIT