One of the schools of Tlön goes so far as to negate time; it reasons that the present is indefinite, that the future has no reality other than as a present hope, that the past has no reality other than as a present memory. Another school declares that all time has already transpired and that our life is only the crepuscular and no doubt falsified an mutilated memory or reflection of an irrecoverable process. Another, that the history of the universe — and in it our lives and the most tenuous detail of our lives — is the scripture produced by a subordinate god in order to communicate with a demon. Another, that the universe is comparable to those cryptographs in which not all the symbols are valid and that only what happens every three hundred nights is true. Another, that while we sleep here, we are awake elsewhere and that in this way every man is two men.
Jorge Luis Borges, Labyrinths:  Selected Stories and Other Writings
future, labyrinths, past, present, time