No man is more unhappy than the one who is never in adversity; the greatest affliction of life is never to be afflicted.

It is man's consolation that the future is to be a sunrise instead of a sunset.

He was fond of books, for they are cool and sure friends

I exist," murmurs someone whose name is Everyone. "I'm young and in love; I am old and I want rest; I work, I prosper, I do good business, I have houses to rent, money in State Securities; I am happy, I have wife and children; I like all these things and I want to go on living, so leave me alone."... There are moments when all this casts a deep chill on the large-minded pioneers of the human race.

Great blunders are often made, like large ropes, of a multitude of fibres.

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.

There shall be no slavery of the mind.