famous poem

tell me less or tell me more
in his guarded tent
brief on a flying night
out of me unworthy and unknown
among the smoke and fog of a december afternoon
i have heard that a certain princess
the air is like a butterfly
what spiteful chance steals unawares
suddenly, out of dark and leafy ways
the ships are lying in the bay
shines the last age, the next with hope is seen
still thirteen years
i stood by the open casement