In the first place, if that which is naturally less
likely has happened, then that which is more likely will most probably have
happened. If that which usually happens afterwards has happened, then that which
precedes must also have happened; for instance, if a man has forgotten a thing,
he must once have learnt it.
Aristotle in 23 Volumes, Vol. 22, translated by J. H. Freese. Aristotle. Cambridge and London. Harvard University Press; William Heinemann Ltd. 1926.
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