You are never too old to set another goal or to dream a new dream.

If you think you understand quantum mechanics, you don't understand quantum mechanics.

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

身份高贵的人，不应该欺凌地位卑贱的人；腰缠万贯的人，不应该对穷人傲慢无礼。否则的话，他的荣华富贵就很难持久了。