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. The
capacity for contraries, then, is present at the same time; but
contraries cannot be present at the same time, and the actualities
also cannot be present at the same time, e.g. health and illness.
Therefore, while the good must be one of them, the capacity is both
alike, or neither; the actuality, then, is better. Also in the case of
bad things the end or actuality must be worse than the potency; for
that which 'can' is both contraries alike. Clearly, then, the bad does
not exist apart from bad things; for the bad is in its nature
posterior to the potency. And therefore we may also say that in the
things which are from the beginning, i.e. in eternal things, there
is nothing bad, nothing defective, nothing perverted (for perversion
is something bad).
It is an activity also that geometrical constructions are
discovered; for we find them by dividing. If the figures had been
already divided, the constructions would have been obvious; but as
it is they are present only potentially. Why are the angles of the
triangle equal to two right angles? Because the angles about one point
are equal to two right angles. If, then, the line parallel to the side
had been already drawn upwards, the reason would have been evident
to any one as soon as he saw the figure. Why is the angle in a
semicircle in all cases a right angle? If three lines are equal the
two which form the base, and the perpendicular from the centre-the
conclusion is evident at a glance to one who knows the former
proposition
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