It would appear that Milton has stopped addressing the muse, the Heavenly Muse, and that he has begun addressing himself although that's unclear.

它所呈现的是弥尔顿已经不再跟缪斯讲话了，天国的缪斯，他已经开始跟自己讲话了,尽管这不太确定。

耶鲁公开课 - 弥尔顿课程节选