唯一真正的监狱是恐惧,唯一真正的自由是从恐惧中解脱。
The only real prison is fear, and the only real freedom is freedom from fear.
数学不是关于数字、方程、计算或算法的:它是关于理解的。
The first step in the art of cutting metals is to find a man who has the necessary skill and experience.
If knowledge can create problems, it is not through ignorance that we can solve them.