Cautiousness in judgment is nowadays to be recommended to each and every one: if we gained only one incontestable truth every ten years from each of our philosophical writers the harvest we reaped would be sufficient.

The great trick of regarding small departures from the truth as the truth itself - on which is founded the entire integral calculus - is also the basis of our witty speculations, where the whole thing would often collapse if we considered the departures with philosophical rigour.

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

The highest point to which a weak but experienced mind can rise is detecting the weakness of better men.

To write brashly about some things, it is almost necessary not to know much about them.

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

The proof that man is the noblest of all creatures is that no other creature has ever denied it.