Successful people maintain a positive focus in life no matter what is going on around them. They stay focused on their past successes rather than their past failures, and on the next action steps they need to take to get them closer to the fulfillment of their goals rather than all the other distractions that life presents to them.

数学的本质不仅在于解决问题，还在于提出正确的问题。

凡是有形的事物，都是虚幻不实的。

Humanity's greatest enemy is itself.

写作是一种存在于世界的方式，一种观察和理解它的方式。

If history were taught in the form of stories, it would never be forgotten.