“I think we ought always to entertain our opinions with some measure of doubt. I shouldn't wish people dogmatically to believe any philosophy, not even mine. ”

“If by any chance a playwright wishes to express a political opinion or a moral opinion or a philosophy, he must be a good enough craftsman to do it with so much spice of entertainment in it that the public get the message without being aware of it.”

“We aren't allowed to have any opinions. People can tell you to keep your mouth shut, but it doesn't stop you having your own opinion. Even if people are still very young, they shouldn't be prevented from saying what they think.”

“What should we think of someone who never admits error, never entertains doubt but adheres unflinchingly to the same ideas all his life, regardless of new evidence? Doubt and skepticism are signs of rationality. When we are too certain of our opinions, we run the risk of ignoring any evidence that conflicts with our views. It is doubt that shows we are still thinking, still willing to reexamine hardened beliefs when confronted with new facts and new evidence.”

“No doubt our accepting what we are must always inhibit our being what we ought to be.”

“I am always glad when any of my books can be put into an inexpensive edition, because I like to think that any people who might wish to read them can do so. Surely books ought to be within reach of everybody.”