I read in a book1 that these four lines of verse from William Blake's Auguries of Innocence2 are considered by some the finest four lines of English literature. Well, I do not know about that, but they certainly do have an appeal to me in their Hermetic vision of the World:

1. 1. England's Best Beloved Poems by George Courtauld
2. 2. To check the whole poem see e.g. this link