The correct answer is Voltaire.
This quote represents Voltaire's opinion on freedom of speech. Voltaire, an Enlightenment thinker, felt that the ability of an individual to express their views on events happening within their society was an important part of the democratic process. Even though the views shared by an individual may not be popular or well received, each person has the right to share their views (according to Voltaire).
This concept had a tremendous impact on American history, as the freedom of speech is one of the most important freedoms granted to American citizens in the US Constitution.