Freeman? That's one of my favorite lines from Blake's "Proverbs of Hell"...

My friend the Angel climb'd up from his station into the mill; I remain'd alone, & then this appearance was no more, but I found myself sitting on a pleasant bank beside a river by moonlight hearing a harper who sung to the harp, & his theme was, The man who never alters his opinion is like standing water, & breeds reptiles of the mind.