One foul sentence does more hurt than many foul examples. For these do but corrupt the stream；the other corrupt the fountain.

"The truth is rarely pure and never simple."

释义：善良如同四季常青的松树，邪恶如同娇艳的花朵。从表面上看，花朵似乎比松树更美丽，但当遇到风霜时，松树依然挺立，而花朵却凋零了。