Who can afford to do professional work for nothing?

The beauty of mathematics is that it allows us to explore the universe without ever leaving our chairs.

成功不是幸福的关键。幸福才是成功的关键。如果你热爱你所做的事情，你就会成功。

【释义】家庭内部和睦，家道才能兴旺；对外与人相处融洽，事业方能顺利。