Time present and time past
	Are both perhaps present in time future
		And time future contained in time past.
			If all time is eternally present
				All time is unredeemable.
					What might have been is an abstraction
						Remaining a perpetual possibility
							Only in a world of speculation.
								What might have been and what has been
									Point to one end, which is always present.
											T. S. Eliot: Burnt Norton (1935)