He not busy being born is busy dying.

Psychology must be a guide to practical living.

The deeper the sorrow, the greater the art.

Theoretically there is a perfect possibility of happiness: believing in the indestructible element within oneself, and not striving towards it.

世界是一本书，不旅行的人只读了一页。

Life is short, make every moment count.

膨胀的概念表明，宇宙在大爆炸后不久经历了一段极其快速的扩张期。