Freedom does not consist in any dreamt-of independence from natural laws, but in the knowledge of these laws, and in the possibility this gives of systematically making them work towards definite ends.

【译文】贪图小利，就会损害重大利益。

The only limit to our realization of tomorrow is our doubts of today.

常看修养品德胜过我的人，则惭愧耻辱油然而生；常看物质享受不如我的人，则埋怨情绪自然消失。