n the Apostle
says, "We see through a glass and in an enigma [*Douay: 'in a dark
manner']," "by the terms 'glass' and 'enigma' certain similitudes are
signified by him, which are accommodated to the vision of God." But to
see the essence of God is not an enigmatic nor a speculative vision,
but is, on the contrary, of an opposite kind. Therefore the divine
essence is not seen through a similitude.

_I answer that,_ Two things are required both for sensible and for
intellectual vision--viz. power of sight, and union of the thing seen
with the sight. For vision is made actual only when the thing seen is
in a certain way in the seer. Now in corporeal things it is clear that
the thing seen cannot be by its essence in the seer, but only by its
likeness; as the similitude of a stone is in the eye, whereby the
vision is made actual; whereas the substance of the stone is not
there. But if the principle of the visual power and the thing seen
were one and the same thing, it would necessarily follow that the seer
would receive both the visual power and the form whereby it sees, from
that one same thing.

Now it is manifest both that God is the author of the intellectual
power, and that He can be seen by the intellect. And since the
intellective power of the creature is not the essence of God, it
follows that it is some kind of participated likeness of Him who is
the first intellect. Hence also the intellectual power of the
creature is called an intelligible light, as it were, derived from
the first light, whether this be understood of the natural power, or
of some perfection superadded of grace or of glory. Therefore, in
order to see God, there must be some similitude of God on the part of
the visual faculty, whereby the intellect is made capable of seeing
God. But on the part of the object seen, which must necessarily be
united to the seer, the essence of God cannot be seen by any created
similitude. First, because as Dionysius says (Div. Nom. i), "by the
similitudes of the inferior order of things, the superior can in no
way be known;" as by the likeness of a body the essence of an
incorporeal thing cannot be known. Much less therefore can the
essence of God be seen by any created likeness whatever. Secondly,
because the essence of God is His own very existence, as was shown
above (Q. 3, A. 4), which cannot be said of any created form; and so
no created form can be the similitude representing the essence of God
to the seer. Th