The Future is, of all things,
the thing least like eternity.
It is the most temporal part of time —
for the Past is frozen and no longer flows,
and the Present is all lit up with eternal rays.
C.S.Lewis
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The past exists in memory (Augustine; We can travel to the past in our minds in the the Fields of Memory); Our minds can imagine and anticipate the future and plan for it, but we can only exist in this moment, the present.