"I have seen roses damasked, red and white, But no such roses see I in her cheeks; And in some perfumes is there more delight"
The purpose in writing this poem is to warn against the sin of vanity. Someone does not have to be beautiful to be loved and respected. So, even though, this woman would not be sought after by most men, the speaker loves her for who she is, not what she looks like. Shakespeare is condemning seeing a person as solely skin deep. He is saying that there is more to a person than their Physical attributes. And, if people would try harder, they would see the personality shine through, rather than focusing on vanity. In the poem, he is giving the reader a list of all of the characteristics that most people would find most unflattering. But, they way in which he speaks on this subject does not seem as those he is repulsed, but affectionate, and forgiving of the feature, that can't or shouldn't be changed.