The affairs of the world are no more than so much trickery, and a man who toils for money or honour or whatever else in deference to the wishes of others, rather than because his own desire or needs lead him to do so, will always be a fool.

Nothing is more dangerous than solitude.

To the man of thought almost nothing is really ridiculous.

Nature reacts not only to physical disease, but also to moral weakness; when the danger increases; she gives us greater courage

There is nothing worse than aggressive stupidity.

Nothing shows a man's character more than what he laughs at.

Everything is hard before it is easy.