I’ve had my best years after fifty. Age is just a number—it’s your attitude that counts.
Quality is not a assurance; it is a proof.
避免错误的最佳方式是积累经验。
I went to the woods because I wanted to live deliberately. I wanted to live deep and suck out all the marrow of life. To put to rout all that was not life. And not, when I had come to die, discover that I had not lived.
成功绝非偶然。它是努力工作、坚持不懈、学习、研究、牺牲，最重要的是对你所做事情的热爱。
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.