Which idea did Voltaire emphasize as vital for a healthy society?

Voltaire emphasized freedom of speech as a fundamental principle essential for a healthy society. He believed that the ability to express one's thoughts, beliefs, and critiques openly was crucial for the advancement of knowledge and social progress. Voltaire famously advocated for the idea that individuals should have the right to speak their minds without fear of retribution from authorities. This perspective aligns with his broader views on civil liberties and the importance of tolerance in discourse, which were revolutionary ideas during his time.

Freedom of speech enables a society to flourish because it encourages the sharing of diverse viewpoints, fostering an environment where ideas can be challenged and improved. The promotion of free expression is seen as vital in enabling democracy and preventing the oppression often found in authoritarian regimes. Voltaire's writings and actions played a significant role in shaping the Enlightenment, underscoring this value as not only desirable but necessary for a just and equitable society.