To preserve the freedom of the human mind then and freedom of the press, every spirit should be ready to devote itself to martyrdom; for as long as we may think as we will, and speak as we think, the condition of man will proceed in improvement.

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Quote text and notes from Wikiquote: Thomas Jefferson (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.