要解决复杂的问题，我们必须首先理解产生这些问题的系统。
To solve complex problems, we must first understand the systems that create them.
The knowledge that you have emerged wiser and stronger from setbacks means that you are, ever after, secure in your ability to survive. You will never truly know yourself, or the strength of your relationships, until both have been tested by adversity. Such knowledge is a true gift, for all that it is painfully won, and it has been worth more than any qualification I ever earned.
The best way to get a project done faster is to start sooner.
The beauty of mathematics lies not only in its ability to describe the world but also in its power to reveal the hidden structures that govern it.