People can be divided into these types: strangers, acquaintances, familiar people, friends, and close friends. True friendship isn't about compliments to your face, but whether you're mentioned when they talk about friends behind your back.

The lightning that precedes the thunder is a common image of the warnings that come before calamity.

"The only real failure in life is not to be true to the best one knows."

The forest doesn’t need us; we need the forest.

问题的根本原因在于，在现代世界里，愚蠢的人自以为是，而聪明的人充满怀疑。

The only good is knowledge and the only evil is ignorance.