最好的想法往往来自最接近问题的人。

I have always believed that if you want to achieve anything in life, you have to work for it.

语言是一种自由创造的过程；其法则和原则是固定的，但生成原则的使用方式是自由且无限多样的。

"I write for kids because I was a kid who needed books."

Every improvement in the circumstances of the society tends either directly or indirectly to raise the real rent of land, to increase the real wealth of the landlord, his power of purchasing the labour, or the produce of the labour of other people.