No man, for any considerable period, can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true.
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它，何时应该服从它。
Doubt is not a pleasant condition， but certainty is an absurd one.
Quality is not an act, it is a habit.