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

There is no greater impediment to progress in the sciences than the desire to see it take place too quickly.

It is almost impossible to carry the torch of truth through a crowd without singeing somebody's beard.

He who says he hates every kind of flattery, and says it in earnest, certainly does not yet know every kind of flattery.

Perhaps in time the so-called Dark Ages will be thought of as including our own.

One has to do something new in order to see something new.

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.