What then is the intelligible line, and where does it exist? It is
posterior to number[43]; for unity appears in the line, since this
starts from the unity (of the point), and because it has but one
dimension (length); now the measure of dimension is not a quantative
(entity). Where then does the intelligible Line exist? It exists only
in the intelligence that defines it; or, if it be a thing, it is but
something intellectual. In the intelligible world, in fact, everything
is intellectual, and such as the thing itself is. It is in this same
world, likewise, where is made the decision where and how the plane,
the solid, and all other figures are to be disposed. For it is not
we who create the figures by conceiving them. This is so because the
figure of the world is anterior to us, and because the natural figures
which are suitable to the productions of nature, are necessarily
anterior to the bodies, and in the intelligible world exist in the
state of primary figures, without determining limits, for these forms
exist in no other subjects; they subsist by themselves, and have no
need of extension, because the extension is the attribute of a subject.