Indulgence is instinctive, while self-discipline is practice. Things that can make you happy in the short term can definitely make you feel pain, and those things that make you feel pain may eventually make you achieve yourself. Low-level desires can be obtained by indulging, while high-level desires need to be restrained to be obtained. Being alone is self-discipline, and the more self-discipline a person has, the more freedom he has.

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