It's an image of ascent toward heaven, from which the boy returns.

这是接近天堂的的样子，从那里，这个孩子又回到地面。

耶鲁公开课 - 现代诗歌课程节选

The heaven in this poem is so far from being the incorporeal - the spiritual heaven of orthodox Christianity that you have an image of an actual orgy, the festal orgy raging under the thyrsus .

这首诗所描绘的天堂与正统基督教所宣扬的,非物质的，精神的天堂是如此大相径庭,弥尔顿描绘了一副纵欲狂欢的场景,在神杖下纵欲狂欢。

耶鲁公开课 - 弥尔顿课程节选