People who cannot find time for recreation are obliged sooner or later to find time for illness.
The biggest regret in life is giving up what should not be given up easily, and stubbornly persisting in what should not be persisted.
进步的真正衡量标准不在于知识的积累,而在于其应用于人类的改善。
The world may be mean, but people don’t have to be, not if they refuse.