Sustainability isn’t an option; it’s the only way forward.

I think that in mathematics, and maybe in life, you have to be willing to be a little bit lost.

Your  biggest  competior is yourself.

【讲解】：我十五岁时开始立志学习，三十岁时能立足与社会，四十岁时能通情达理遇事不再疑惑，五十岁时懂得了天命的道理，六十岁能听的进不同的意见，到了七十岁时已经达到随心所欲，想怎么做就怎么做，也不会超出规矩。

出自《道德经》，耳根在作品中多次引用