When buying a garden hose, an extension cord, or a ladder, get one substantially longer than you think you need. It’ll be the right size.
你注意力的质量决定了你生活的质量。
效率是把事情做对;效果是做对的事情。
成功不仅仅是获胜,而是永不放弃。
A true mathematician is always a student, always learning.