Sonnet Clxxii:

Within my mind I keep a holy plot, Where such ideas as wear unsullied white May move through scenes of ever-fresh delight, Fringed to the pale with blue forget-me-not. Within the boundaries of this virgin spot, No thought o'ershadowed with the primal blight-- No worldly scheme, no falsehood, grave or light-- Can by indulgence or by force be got. Here stands an image sacredly apart From any contact, howsoever pure-- The cloister's goddess while the stars endure. But why should I inform thee what thou art, By any image, or by tropes assure