中年之后，只有已为告别人生做好准备的人，才能继续在生活中朝气蓬勃。

Don't wait until everything is just right. It will never be perfect. There will always be challenges, obstacles and less than perfect conditions. So what. Get started now. With each step you take, you will grow stronger and stronger, more and more skilled, more and more self-confident and more and more successful.

发散级数是魔鬼的发明，基于它们的任何证明都是一种耻辱。

The future belongs to those who can master core technologies.

"The only way to get rid of a temptation is to yield to it."