真正的挑战不在于解方程，而在于理解解的含义。
The real challenge is not in solving the equations, but in understanding what the solutions mean.
天空才是极限，你要明白这一点。
The only secure system is one that is powered off, cast in a block of concrete and sealed in a lead-lined room with armed guards.
最可怕的时刻永远是你开始之前。
最重要的事情是保持最重要的事情是最重要的。