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You can't use up creativity. The more you use, the more you have.

Success is not the key to happiness. Happiness is the key to success.

只有我們個人對自由的信仰才能讓我們保持自由。

The state of nature has a law of nature to govern it, which obliges every one: and reason, which is that law, teaches all mankind, who will but consult it, that... no one ought to harm another in his life, health, liberty, or possessions.

The pursuit of mathematical knowledge is a journey that never ends; there is always more to discover and understand.

The coal industry is the backbone of America.

Ideas are like fish. If you want to catch little fish, you can stay in the shallow water. But if you want to catch the big fish, you've got to go deeper.

The biggest enemy of technology is inertia.