The only way to learn mathematics is to do mathematics.
学习数学的唯一方法就是做数学。
"The greatest glory in living lies not in never falling, but in rising every time we fall."
The condition of man... is a condition of war of everyone against everyone.
数据是一个组织最有价值的资产，而关系模型确保了其完整性和可访问性。
Time is dead as long as it is being clicked off by little wheels; only when the clock stops does time come to life.
Economics is ultimately about improving human welfare.
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.