Doubt everything at least once, even the sentence "Two times two is four."

He who is enamored of himself will at least have the advantage of being inconvenienced by few rivals.

If we make a couple of discoveries here and there we need not believe things will go on like this for ever. Just as we hit water when we dig in the earth, so we discover the incomprehensible sooner or later.

I am convinced we do not only love ourselves in others but hate ourselves in others too.

It is too bad if you have to do everything upon reflection and can't do anything from early habit.

The thoughts written on the walls of madhouses by their inmates might be worth publicizing.

The journalists have constructed for themselves a little wooden chapel, which they also call the Temple of Fame, in which they put up and take down portraits all day long and make such a hammering you can't hear yourself speak.