Amiens's song helps close out Act Two as a whole. In the song, the singer speaks to nature and winter, claiming that the harshness of the natural world is not nearly as cruel as humans can be when they forget one another or betray a friendship.
The song is interesting for many reasons. Firstly, it offers a kind of opposition to Duke Senior's view of nature as wholly benevolent and good. Nature can be harsh and inhospitable to the unwary, unprepared person.
Secondly, the song criticizes the fragility of human relationships, which relates to the current position of the Duke and his retainers who have been banished from court. They are essentially forgotten men who have lost everything, including the "benefits forgot"...
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