樂事是短暫的 – 它只是為自己；工作可以在長久的快樂留下印記，工作是為別人。Pleasures flit by – they are only for yourself; work leaves a mark of long-lasting joy, work is for others.

Pleasures flit by – they are only for yourself; work leaves a mark of long-lasting joy, work is for others.
– Dmitri Mendeleev, Chemist
樂事是短暫的 – 它只是為自己；工作可以在長久的快樂留下印記，工作是為別人。

– 德米特里·門得列夫 (1834－1907) 俄國科學家，發現化學元素的週期性，並製作出世界上第一張元素週期表。