每首诗都是一首情诗。
Every poem is a love poem.
Most people are other people. Their thoughts are someone else’s opinions, their lives a mimicry, their passions a quotation.
To be free is not to have no master, but to choose your own.
在数学中，提出问题的艺术必须比解决问题更有价值。
A moral being is one who is capable of reflecting on his past actions and their motives.