Voltaire was a French Enlightenment writer and philosopher known for his wit, advocacy of freedom of speech and separation of church and state. He was repeatedly jailed and exiled for his controversial writings criticizing religious and political authorities. His most famous work, Candide, satirizes philosophical optimism in response to the Lisbon earthquake. It was an immediate popular success due to its brevity, humor and accessibility. Voltaire inspired leaders of the American and French Revolutions with his ideals of liberty, reason and progress.