“If you will tell me why the fen
appears impassable, I then
will tell you why I think that I
can get across it if I try.”

Marianne Moore, “I May, I Might, I Must” 

The sheer, ornery passion of this poem is breathtaking, betokened by the escalating assurance of the title. Although this may be about a specific geography where she happens to know a shortcut, I read it as any fen or any obstacle where she will be undaunted in her efforts. Just try telling this poet she can’t!