如果一种教义不是费解的，它就必须是含糊的，如果它既不费解也不含糊，它就必须是无法验证的。

The greatest discovery of my generation is that human beings can alter their lives by altering their attitudes of mind.

The bigger the brain, the more complex the social world it can manage.

Sometimes, the most dangerous lies are the ones we tell ourselves.

We must balance short-term profitability with long-term environmental responsibility.

You can't build a peaceful world on empty stomachs and human misery.