It is dangerous to be sincere unless you are also stupid.

Freedom, my good girl, means being able to count on how other people will behave.

Social progress takes effect through the replacement of all institutions by new ones; and since every institution involves the recognition of the duty of conforming to it, progress must involve the repudiation of an established duty at every step.

A book is like a child: it is easier to bring it into the world than to control it when it is launched there.

I can forgive Alfred Nobel for having invented dynamite, but only a fiend in human form could have invented the Nobel Prize.

An interesting play cannot in the nature of things mean anything but a play in which problems of conduct and character of personalimportance to the audience are raised and suggestively discussed.

At present there is not a single credible established religion in the world.