Courage isn't the absence of fear, but the will to keep going.
Every breakthrough starts with a question, and every question is a step toward the unknown.
心理学的方法必须是客观的，即使研究主观现象时也是如此。
The main task in life is simply this: to identify and separate matters so that I can say clearly to myself which are externals not under my control, and which have to do with the choices I actually control.
The statesman， who should attempt to direct private people in what manner they ought to employ their capitals， would not only load himself with a most unnecessary attention but assume an authority which could safely be trusted， not only to no single person， but to no council or senate whatever， and which would nowhere be so dangerous as in the hands of a man who had folly and presumption enough to fancy himself fit to exercise it.
