Thinking is the ultimate human resource. Yet we can never be satisfied with our most important skill. No matter how good we become, we should always want to be better

I'm a very loyal and unreliable friend.

Argument is meant to reveal the truth, not to create it.

Removing the faults in a stage-coach may produce a perfect stage-coach, but it is unlikely to produce the first motor car.

Everyone has the right to doubt everything as often as he pleases and the duty to do it at least once. No way of looking at things is too sacred to be reconsidered. No way of doing things is beyond improvement.

Creativity makes life more fun and more interesting.

What is urgent will always take precedence over what is important.