The existence of any evil anywhere at any time absolutely ruins a total optimism.

Sanity is madness put to good use.

Any attempt to speak without speaking any particular language is not more hopeless than the attempt to have a religion that shall be no religion in particular.... Every living and healthy religion has a marked idiosyncrasy. Its power consists in its special and surprising message and the bias which that revelation gives to life.

What is more important in life than our bodies or in the world than what we look like?

Intolerance is a form of egotism, and to condemn egotism intolerantly is to share it.

Sanctity and genius are as rebellious as vice.

If all art aspires to the condition of music, all the sciences aspire to the condition of mathematics.