A ship in port is safe, but that is not what ships are built for.

孔子说：“君子团结群众而不拉帮结派，小人拉帮结派而不团结群众。”

The key to managing complexity is to focus on the interfaces between components, not their implementations.

译文：假如你命中富贵荣华，也要常常有不得意的想法；假如你碰到境遇顺利，也要常常有不如意的念头；假如眼前的你吃穿丰足，也要保持节俭不忘贫困；假如别人都很喜欢你，也要常常怀着谨慎的想法；假如你家世名望都很高，也要常怀着谦虚卑下之心；假如你的学问非常高深，也要提醒自己掌握的还不够多。

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.