There is no supernatural, there is only nature. Nature alone exists and contains all. All is. There is the part of nature that we perceive, and the part of nature that we do not perceive. ... If you abandon these facts, beware; charlatans will light upon them, also the imbecile. There is no mean: science, or ignorance. If science does not want these facts, ignorance will take them up. You have refused to enlarge human intelligence, you augment human stupidity. When Laplace withdraws Cagliostro appears.

The holy law of Jesus Christ governs our civilisation, but it does not yet permeate it.

There is no more sovereign eloquence than the truth in indignation.

Oh! Everything I loved!

One resists the invasion of armies; one does not resist the invasion of ideas.

Nothing makes a man so adventurous as an empty pocket.

Every bird which flies has the thread of the infinite in its claw.