The right of commanding is no longer an advantage transmitted by nature; like an inheritance, it is the fruit of labors, the price of courage.

If there were only one religion in England there would be danger of despotism, if there were two, they would cut each other's throats, but there are thirty, and they live in peace and happiness.

Theological religion is the source of all imaginable follies and disturbances. It is the parent of fanaticism and civil discord; it is the enemy of mankind.

Doubt is not a very agreeable status, but certainty is a ridiculous one.

The most amazing and effective inventions are not those which do most honour to the human genius.

The way to become boring is to say everything.

Doubt is uncomfortable, certainty is ridiculous.