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.-All these relations, then, are numerically
expressed and are determinations of number, and so in another way
are the equal and the like and the same. For all refer to unity. Those
things are the same whose substance is one; those are like whose
quality is one; those are equal whose quantity is one; and 1 is the
beginning and measure of number, so that all these relations imply
number, though not in the same way.
(2) Things that are active or passive imply an active or a passive
potency and the actualizations of the potencies; e.g. that which is
capable of heating is related to that which is capable of being
heated, because it can heat it, and, again, that which heats is
related to that which is heated and that which cuts to that which is
cut, in the sense that they actually do these things. But numerical
relations are not actualized except in the sense which has been
elsewhere stated; actualizations in the sense of movement they have
not. Of relations which imply potency some further imply particular
periods of time, e.g. that which has made is relative to that which
has been made, and that which will make to that which will be made.
For it is in this way that a father is called the father of his son;
for the one has acted and the other has been acted on in a certain
way. Further, some relative terms imply privation of potency, i.e.
'incapable' and terms of this sort, e.g
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