(Ps.
35:10).

_I answer that,_ Everything which is raised up to what exceeds its
nature, must be prepared by some disposition above its nature; as, for
example, if air is to receive the form of fire, it must be prepared by
some disposition for such a form. But when any created intellect sees
the essence of God, the essence of God itself becomes the intelligible
form of the intellect. Hence it is necessary that some supernatural
disposition should be added to the intellect in order that it may be
raised up to such a great and sublime height. Now since the natural
power of the created intellect does not avail to enable it to see the
essence of God, as was shown in the preceding article, it is necessary
that the power of understanding should be added by divine grace. Now
this increase of the intellectual powers is called the illumination of
the intellect, as we also call the intelligible object itself by the
name of light of illumination. And this is the light spoken of in the
Apocalypse (Apoc. 21:23): "The glory of God hath enlightened
it"--viz. the society of the blessed who see God. By this light the
blessed are made "deiform"--i.e. like to God, according to the
saying: "When He shall appear we shall be like to Him, and [Vulg.:
'because'] we shall see Him as He is" (1 John 2:2).

Reply Obj. 1: The created light is necessary to see the
essence of God, not in order to make the essence of God intelligible,
which is of itself intelligible, but in order to enable the intellect
to understand in the same way as a habit makes a power abler to act.
Even so corporeal light is necessary as regards external sight,
inasmuch as it makes the medium actually transparent, and susceptible
of color.

Reply Obj. 2: This light is required to see the divine
essence, not as a similitude in which God is seen, but as a perfection
of the intellect, strengthening it to see God. Therefore it may be
said that this light is to be described not as a medium in which God
is seen, but as one by which He is seen; and such a medium does not
take away the immediate vision of God.

Reply Obj. 3: The disposition to the form of fire can be
natural only to the subject of that form. Hence the light of glory
cannot be natural to a creature unless the creature has a divine
nature; which is impossible. But by this light the rational creature
is made deiform, as is said in this article.
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SIXTH ARTICLE [I. Q. 12, Art. 6]

Whether o