The idea of revolution is an adolescent fantasy.
自由不是没有主人，而是选择自己的主人。
Sustainability is not a choice, it's a necessity.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的：它是关于理解的。
水，涌出，自然地流淌；至人的德行，不需着意修炼，万物自会随附。就像天自然高，地自然厚，日月自然明，何需修行！
Every piece of leather tells a story; our job is to make it a good one.