A person may cause evil to others not only by his actions but by his inaction, and in either case, he is justly accountable to them for the injury.
成功者与不成功者的唯一区别就是是否愿意努力工作。
学习是通过修改符号结构来提高性能的过程。
风俗的专制无处不是人类进步的阻碍。