By physical liberty I mean the right to do anything which does not interfere with the happiness of another. By intellectual liberty I mean the right to think wrong.
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About Robert G. Ingersoll
Robert G. Ingersoll was a 19th-century agnostic, lawyer, politician and orator. Robert Green Ingersoll, nicknamed "the Great Agnostic", was an American lawyer, writer, and orator during the Golden Age of Free Thought, who campaigned in defense of agnosticism. Read more on Wikipedia →