We must watch over our modesty in the presence of those who cannot understand its grounds.

One kills a man, one is an assassin; one kills millions, one is a conqueror; one kills everybody, one is a god.

We bestow on others praise in which we do not believe, on condition that in return they bestow upon us praise in which we do.

It is sometimes important for science to know how to forget the things she is surest of.

The biologist passes. The frog stays the same.

I prefer the honest jargon of reality to the outright lies of books.

I still understand a few words in life, but I no longer think they make a sentence.