对自然的研究是永恒的乐趣。

思想是行动的仆人，而行动是生存的仆人。

I want to stand as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center.

翻译：指出农业是国家的根本，农业稳定则国家安宁。