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Happiness is the very nature of the self; happiness and the self are not different. There is no happiness in any object of the world. We imagine through our ignorance that we derive happiness from objects.

少即是多，知足常樂。

The joy of mathematics is in the struggle to understand.

翻譯：所以不完全了解用兵的危害，就不能完全了解用兵的好處。