就其与我们之自然联系而言，每一种快乐都是善的，然而并非每一种快乐都是可取的；同理，虽然每一种痛苦都是恶的，但并非每一种痛苦从本质上都应当加以躲避。

Every pleasure then because of its natural kinship to us is good, yet not every pleasure is to be chosen; even as every pain also is an evil, yet not all are always of a nature to be avoided.

youdao

世上只有一种善——知识；只有一种恶——无知。

There is only one good, knowledge, and one evil, ignorance.

youdao

对于那被住上掷的石头来说，落下决非一种恶，而它被人携带也的确并非一种善。

For the stone which has been thrown up it is no evil to come down, nor indeed any good to have been carried up.

youdao