“The trouble is that, as with most clichés, “Poetry teaches us what it means to be human” does contain an element of truth. Like maths, or political theory, poetry is a form of thought. It is a way in which human understanding goes on. This being the case, we might expect good poetry to understand more, or more deeply, than bad verse does, just as professional mathematicians can discover what high school students can’t. Sure enough, we find William McGonagall’s odes implausible and hilarious but read William Shakespeare’s sonnets for insights into lovers’ behaviour.”