我不与任何人竞争，只与自己竞争。我的目标是比昨天的自己更好。

"The truth is rarely pure and never simple."

"I like dogs. You always know what a dog is thinking. It has four moods. Happy, sad, cross and concentrating."

"The past is never dead. It's not even past."

物理学的语言是数学，但其意义是哲学。