The Nativity Ode is continually presenting the speaker with temptations, with incitements to sin that need to be purged from the speaker's poetic voice.

圣诞清晨歌》继续呈现给诗歌发言者一些诱惑，对罪孽的激励需要,诗歌语言发言者来净化。

耶鲁公开课 - 弥尔顿课程节选

What exactly that purgation will entail and why Milton's voice needs to be purged at all I think these questions are really the subject of the entire rest of the poem.

这种净化是很有必要的,弥尔顿的语言为什么需要被完全净化,我认为这个问题才是所有剩余诗歌,真正的主题。

耶鲁公开课 - 弥尔顿课程节选

But the hymn at the same time is something like the process, the process by which Milton is attempting to purge and cleanse his poetic voice and make it a voice that will actually be equal to the extraordinary ambition that he has for it.

但颂歌同时又像一个过程，在这个过程中弥尔顿尝试净化,他诗歌的语言，把它变的,像他当初想的那样非同寻常,人人都渴望得到。

耶鲁公开课 - 弥尔顿课程节选