定义就是限制。
Science should always serve humanity, not the other way around.
Everything can be taken from a man but one thing: the last of the human freedoms—to choose one's attitude in any given set of circumstances.
真正的领导者不是那些发号施令的人,而是那些能够激励他人自愿跟随的人。
"The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart."