from the supreme intellect, and whereby it abstracts from matter,
flowing from the essence of the soul, in the same way as its other
powers.
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FIFTH ARTICLE [I, Q. 79, Art. 5]

Whether the Active Intellect Is One in All?

Objection 1: It would seem that there is one active intellect in all.
For what is separate from the body is not multiplied according to the
number of bodies. But the active intellect is "separate," as the
Philosopher says (De Anima iii, 5). Therefore it is not multiplied in
the many human bodies, but is one for all men.

Obj. 2: Further, the active intellect is the cause of the universal,
which is one in many. But that which is the cause of unity is still
more itself one. Therefore the active intellect is the same in all.

Obj. 3: Further, all men agree in the first intellectual concepts.
But to these they assent by the active intellect. Therefore all
agree in one active intellect.

_On the contrary,_ The Philosopher says (De Anima iii, 5) that the
active intellect is as a light. But light is not the same in the
various things enlightened. Therefore the same active intellect is
not in various men.

_I answer that,_ The truth about this question depends on what we
have already said (A. 4). For if the active intellect were not
something belonging to the soul, but were some separate substance,
there would be one active intellect for all men. And this is what
they mean who hold that there is one active intellect for all. But if
the active intellect is something belonging to the soul, as one of
its powers, we are bound to say that there are as many active
intellects as there are souls, which are multiplied according to the
number of men, as we have said above (Q. 76, A. 2). For it is
impossible that one same power belong to various substances.

Reply Obj. 1: The Philosopher proves that the active intellect is
separate, by the fact that the passive intellect is separate:
because, as he says (De Anima iii, 5), "the agent is more noble than
the patient." Now the passive intellect is said to be separate,
because it is not the act of any corporeal organ. And in the same
sense the active intellect is also called "separate"; but not as a
separate substance.

Reply Obj. 2: The active intellect is the cause of the universal, by
abstracting it from matter. But for this purpose it need not be the
same intellect in all intelligent beings; but it must be one in its
relationship to al