During an election campaign the air is full of speeches and vice versa.

Mathematicians practice absolute freedom.

One sought not absolute truth. One sought only a spool on which to wind the thread of history without breaking it.

Nothing is easier than to teach historical method, but, when learned, it has little use.

He too serves a certain purpose who only stands and cheers.

No man likes to have his intelligence or good faith questioned, especially if he has doubts about it himself.

Nothing is more tiresome than a superannuated pedagogue.