证明是一种用于使他人相信数学陈述为真的工具。
Every building is a response to its place.
成为英雄的最大障碍是怀疑自己是否会证明自己是个傻瓜；真正的英雄主义是抵制这种怀疑；最深刻的智慧是知道何时应该抵制，何时应该服从。
When life seems hard, the courageous do not lie down and accept defeat; instead, they are all the more determined to struggle for better future.
"The world is full of obvious things which nobody by any chance ever observes."
