"She went to bed thinking more about another person than about herself. This goes to prove that even minor poetry may have its practical uses."
Dorothy Sayers, Gaudy Night, chapter 18
Here is what I like about this quotation. It is always a practical good to be thinking about the good for another person rather than about oneself. Good poetry does this. (This is why I think that so much Romantic poetry is not good -- beautiful perhaps, but not good. The poem in question is more in the line of the metaphysical poets.) Anything good does as well. Self-absorption is the essence of sin; self-gift is the essence of virtue. We need to be giving ourselves away, even in our thoughts. Of course, any desire to possess or control the other is really about self. Good art (or anything) draws us out, not in.