Even if you discount the worldly benefits, the act of learning can be a source of enjoyment.

即使你不去考虑实际的好处，学习本身就是一件乐事。

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Among the most frightening sources of danger today are religious zealots whose actions are motivated as much by "other-worldly" costs and benefits as by the sorts of punishments and rewards that we are capable of threatening or offering.

NPR: Rules Should Govern Torture, Dershowitz Says