Quantum mechanics is not just a theory about the world, it is a description of the world at its most fundamental level.

Abstraction is the key to managing complexity in large software systems.

取得成功的秘诀就是开始行动。

A city’s greatness is measured by its public spaces.

子游问孝，孔子说：“现在的孝顺，只是能赡养老人。即使是犬马，都会得到饲养。不敬重，有何区别？”

——温铁军2002年6月温铁军在清华大学的一次讲座

Human kindness has never weakened the stamina or softened the fiber of a free people. A nation does not have to be cruel to be tough.