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幸福的秘密是自由,自由的秘密是勇气。
The secret of happiness is freedom, and the secret of freedom is courage.
"If you want to fly, you have to give up what weighs you down."
"You have to be able to confront reality but also inspire hope."
Each success only buys an admission ticket to a more difficult problem.
数学是一种创造性的努力,就像艺术或音乐一样。
宇宙不仅比我们想象的更奇怪,而且比我们能够想象的还要奇怪。
A failure is not always a mistake, it may simply be the best one can do under the circumstances. The real mistake is to stop trying.
Scars have the strange power to remind us that our past is real.