健康的精神寓于健康的身体, 这话虽短，但却可完全阐释人生在世幸福之真谛。这二者兼备的人，夫复何求；欠缺其中任意一个的人, 与其他任何事上都难达完美（离更好总会差那么一点点）。人的幸福或痛苦, 大部分是源于自身造就。那些没有理智指引的人永远走不到正确的道路上；而那些身体孱弱的人永远无力抬升内在（的精神或灵魂）。

The advantages found in history seem to be of three kinds， as they result either from the mere situation of the climate and country or from the form of government and of the character of the people， or from those finer principles and morals， which may be called the recommendations of philosophy.

In the end, we will remember not the words of our enemies, but the silence of our friends.

语言是可见与不可见之间的桥梁。

The best forestry practices are those that leave no trace but leave everything changed.

A long habit of not thinking a thing wrong, gives it a superficial appearance of being right.