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我最好的年华是在50岁之后。年龄只是一个数字——重要的是你的态度。
I’ve had my best years after fifty. Age is just a number—it’s your attitude that counts. 
译文:每天都要纠正自己的过错。如果哪天没有发现过失,那就会自以为是;如果每天都觉得无过错,那就会寸步难进。天下聪明俊秀的人才不少,他们之所以不去努力地培养德行,扩大事业,是因为受了得过且过的思想影响,耽误终生。
数学的美在于它如此简单却又如此强大。
The only way to do great work is to love what you do.
"The magic of a book is that it can take you anywhere, even if you're just sitting in your room."
创新不在于技术,而在于解决实际问题。