生物为生存而进行的普遍斗争，不是为了原材料，也不是为了能量——能量以热的形式大量存在于每个物体中（可惜无法转化）；而是为了熵，它通过能量从炽热的太阳转移到寒冷的地球而变得可用。

The time which we have at our disposal every day is elastic; the passions that we feel expand it, those that we inspire contract it.

Our highest endeavor must be to develop free human beings who are able of themselves to impart purpose and direction to their lives.

永远不要过度交易。这样做是违反成功交易的基本规则。