With the word only to mop the face of the world
And the heart wriggles all nostalgia

I love these two lines. It shows what writers try to do with their words - to clean things up, make them better, heal the fevered and sick. But then the second line shows that words can also infect. The "heart wriggling" as if it's become a worm, or caught some infection - but a wonderful one, that dis-orients the body with memory and gratitude.