,
3) that the animal and the man are not made at the same time, but
first of all the animal is made having a sensitive soul. Therefore
also the intellectual soul is produced from the semen.

Obj. 3: Further, it is one and the same agent whose action is
directed to the matter and to the form: else from the matter and
the form there would not result something simply one. But the
intellectual soul is the form of the human body, which is produced
by the power of the semen. Therefore the intellectual soul also is
produced by the power of the semen.

Obj. 4: Further, man begets his like in species. But the human
species is constituted by the rational soul. Therefore the rational
soul is from the begetter.

Obj. 5: Further, it cannot be said that God concurs in sin. But if
the rational soul be created by God, sometimes God concurs in the
sin of adultery, since sometimes offspring is begotten of illicit
intercourse. Therefore the rational soul is not created by God.

_On the contrary,_ It is written in De Eccl. Dogmat. xiv that "the
rational soul is not engendered by coition."

_I answer that,_ It is impossible for an active power existing in
matter to extend its action to the production of an immaterial
effect. Now it is manifest that the intellectual principle in man
transcends matter; for it has an operation in which the body takes no
part whatever. It is therefore impossible for the seminal power to
produce the intellectual principle.

Again, the seminal power acts by virtue of the soul of the begetter
according as the soul of the begetter is the act of the body, making
use of the body in its operation. Now the body has nothing whatever
to do in the operation of the intellect. Therefore the power of the
intellectual principle, as intellectual, cannot reach the semen.
Hence the Philosopher says (De Gener. Animal. ii, 3): "It follows
that the intellect alone comes from without."

Again, since the intellectual soul has an operation independent of
the body, it is subsistent, as proved above (Q. 75, A. 2): therefore
to be and to be made are proper to it. Moreover, since it is an
immaterial substance it cannot be caused through generation, but only
through creation by God. Therefore to hold that the intellectual soul
is caused by the begetter, is nothing else than to hold the soul to
be non-subsistent and consequently to perish with the body. It is
therefore heretical to say that the intellectual soul is transmitted
wit