Success = 1 part work + 1 part play + 1 part keep your mouth shut

Don't be too hard on me. Everyone has to sacrifice at the altar of stupidity from time to time.

The world will not be destroyed by those who do evil, but by those who watch them without doing anything.

The sole function of education...[is] to open the way to thinking and knowing, and the school, as the outstanding organ for the people's education, must serve that end exclusively.

It is certainly true that principles cannot be more securely founded than on experience and consciously clear thinking.

Genius is 1% talent and 99% percent hard work.

Time and space are modes by which we think and not conditions in which we live.