The theme of this poem is that there is no possibility of seeing beauty in what you do not love or admire.
Explanation:
The speaker of this poem sees no value in himself, no wonder, and no love for himself, so he cannot see any beauty in himself, not inwardly, much less outwardly, and no matter what other people say. There is beauty in him, because his disregard for himself makes him disbelieve anyone's words if not his own. The poem shows how we will not be able to see beauty in what we do not love or admire, we will only be able to see horrible and disappointing things in these situations.
