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If it doesn’t challenge you, it doesn’t change you.

A comfort zone is a beautiful place, but nothing ever grows there.

Excellent firms don’t believe in excellence – only in constant improvement and constant change.

Some people put walls up, not to keep people out, but to see who cares enough to knock them down.

There are three classes of people: those who see. Those who see when they are shown. Those who do not see.

As far as intelligence is concerned, I have personally concluded that the ability to change one’s mind is the highest form of human intelligence; fundamentally, the ability to recognize that one can be wrong; that is what I call intelligence. This is the best brain-training I can recommend as a former Mensan: to try to keep an open mind.

The most dangerous phrase in the language is, “We’ve always done it this way.”

We should seek the greatest value of our action.

Intelligence is the ability to adapt to change.

It is not clear that intelligence has any long-term survival value.