数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
The trick is not to learn to trust your gut feelings, but rather to discipline yourself to ignore them.
身体单薄无力，就不要去背负重物，说话没有分量，就不要去规劝别人；没有钱就不要到人群中去，遭遇困难之际千万别去寻求亲戚的帮助。
