数学的本质在于它的自由。
The essence of mathematics lies in its freedom.
你的行为会带来改变,而你必须决定你想带来什么样的改变。
友谊不在于你认识谁最久,而在于谁走进你的生活说"我在这里支持你",并且证明了这一点。
It seems to me that if you or I must choose between two courses of thought or action, we should remember our dying and try so to live that our death brings no pleasure to the world.
"I never think about what could go wrong. I only focus on what I need to do right."
永远不要停止学习,因为世界永远不会停止变化。