The invisible people knew that happiness is not the natural state of mankind, and is never achieved from the outside in.

The invisible people knew that happiness is not the natural state of mankind, and is never achieved from the outside in.

看不见的人知道，幸福不是人类的自然状态，也永远不会从外而内获得。

-- Terry Pratchett 泰瑞·普莱契