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. Obviously, therefore, the potentially existing
constructions are discovered by being brought to actuality; the reason
is that the geometer's thinking is an actuality; so that the potency
proceeds from an actuality; and therefore it is by making
constructions that people come to know them (though the single
actuality is later in generation than the corresponding potency).
(See diagram.)
10
The terms 'being' and 'non-being' are employed firstly with
reference to the categories, and secondly with reference to the
potency or actuality of these or their non-potency or nonactuality,
and thirdly in the sense of true and false. This depends, on the
side of the objects, on their being combined or separated, so that
he who thinks the separated to be separated and the combined to be
combined has the truth, while he whose thought is in a state
contrary to that of the objects is in error. This being so, when is
what is called truth or falsity present, and when is it not? We must
consider what we mean by these terms. It is not because we think truly
that you are pale, that you are pale, but because you are pale we
who say this have the truth. If, then, some things are always combined
and cannot be separated, and others are always separated and cannot be
combined, while others are capable either of combination or of
separation, 'being' is being combined and one, and 'not being' is
being not combined but more than one
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