When people talk, listen completely. Most people never listen.

To every action there is always opposed an equal reaction； or， the mutual actions of two bodies upon each other are always equal， and directed to contrary parts.

无论一个人被认为多么自私，他的本性中显然存在某些原则，这些原则使他对别人的命运感兴趣，并将他们的幸福视为自己的必要，尽管他从中除了看到它时的快乐外一无所得。

书是一次心灵的旅程。