to understand or to feel is a kind of movement, as the
Philosopher says (De Anima iii, 7). But the intellectual light which
is natural to the soul, is a sufficient principle of understanding.
Therefore it is not moved by another.

Obj. 3: Further, as the senses are moved by the sensible, so the
intellect is moved by the intelligible. But God is not intelligible
to us, and exceeds the capacity of our intellect. Therefore God
cannot move our intellect.

_On the contrary,_ The teacher moves the intellect of the one taught.
But it is written (Ps. 93:10) that God "teaches man knowledge."
Therefore God moves the human intellect.

_I answer that,_ As in corporeal movement that is called the mover
which gives the form that is the principle of movement, so that is
said to move the intellect, which is the cause of the form that is
the principle of the intellectual operation, called the movement of
the intellect. Now there is a twofold principle of intellectual
operation in the intelligent being; one which is the intellectual
power itself, which principle exists in the one who understands in
potentiality; while the other is the principle of actual
understanding, namely, the likeness of the thing understood in the
one who understands. So a thing is said to move the intellect,
whether it gives to him who understands the power of understanding;
or impresses on him the likeness of the thing understood.

Now God moves the created intellect in both ways. For He is the First
immaterial Being; and as intellectuality is a result of immateriality,
it follows that He is the First intelligent Being. Therefore since in
each order the first is the cause of all that follows, we must
conclude that from Him proceeds all intellectual power. In like
manner, since He is the First Being, and all other beings pre-exist in
Him as in their First Cause, it follows that they exist intelligibly
in Him, after the mode of His own Nature. For as the intelligible
types of everything exist first of all in God, and are derived from
Him by other intellects in order that these may actually understand;
so also are they derived by creatures that they may subsist. Therefore
God so moves the created intellect, inasmuch as He gives it the
intellectual power, whether natural, or superadded; and impresses on
the created intellect the intelligible species, and maintains and
preserves both power and species in existence.

Reply Obj. 1: The intellectual operation is p