The total amount of suffering per year in the natural world is beyond all decent contemplation. During the minute that it takes me to compose this sentence, thousands of animals are being eaten alive, many others are running for their lives, whimpering with fear, others are slowly being devoured from within by rasping parasites, thousands of all kinds are dying of starvation, thirst, and disease.

"Books are the most powerful weapons in the world."

Pain is temporary. It may last a minute, or an hour, or a day, or a year, but eventually it will subside and something else will take its place. If I quit, however, it lasts forever.

The only way to discover the limits of the possible is to go beyond them into the impossible.

The only way to learn mathematics is to do mathematics.

每个人都有不为世人所知的秘密悲伤；很多时候，我们称一个人冷漠，而他只是悲伤。

预测未来的最好方法就是创造未来。在能源领域，这意味着开发新技术和新商业模式。