Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.
预测未来的最好方法就是创造未来。
If you do not tell the truth about yourself you cannot tell it about other people.
Certification schemes are the grammar of responsible forestry—they give structure to our good intentions.