"If you can’t fly, then run. If you can’t run, then walk. If you can’t walk, then crawl. But whatever you do, you have to keep moving forward."
Freedom and order are not incompatible; truth is strength; free discussion is the very life of truth.  
最危险的谎言不是对别人说的,而是对自己说的。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.