書籍是最安靜、最恒久的朋友；它們是最易接近、最睿智的顧問，也是最耐心的老師。
土地記得，即使人們忘記了。
The state, therefore, has not existed from all eternity. There have been societies that did without it, that had no notion of the state or state power. At a certain stage of economic development, which was necessarily bound up with the split of society into classes, the state became a necessity.
追求完美的想法，是一個好計劃的最大敵人。
地球是一個具有特定組織的宇宙?zhèn)€體，一個獨特的實體。
生活的最好方式是熱愛你所做的事。