In the book he sets out and defines some of the perennial problems of philosophy, including the problem of evil, free will and determinism, the nature of justice and of virtue.

在这本著作中，他对一些哲学里常年不衰的问题进行阐述并给出了自己的定义，包括罪恶、自由意志和决定论，正义和美德的性质等问题。

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And that's a perennial issue in philosophy.

这在哲学上也是一个经久不衰的问题。

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And that's a perennial issue in philosophy.

这在哲学上也是一个经久不衰的问题。

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