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Let us first
speak of the possible and the impossible. If of two contrary things it is
possible that one should exist or come into existence, then it would seem that
the other is equally possible; for instance, if a man can be cured, he can also
be ill; for the potentiality of contraries, qua contraries, is the
same.1 Similarly, if of two
like things the one is possible, so also is the other.
1 As a general rule, from their nature as contraries, although it may not be true in particular cases. If a man is ill, he may also be well, although in particular cases certain qualities may make him more liable to one or the other, e.g. he may suffer from an incurable disease （Schrader）.
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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