thus, for instance, the pupil of the eye is without
color, so as to be in potentiality as regards all colors; which is
not possible in the organ of touch, since it is composed of the very
elements, the qualities of which are perceived by that sense--or so
that the organ is a medium between two contraries, as much needs be
the case with regard to touch; for the medium is in potentiality to
the extremes.

Reply Obj. 4: In the slime of the earth are earth, and water binding
the earth together. Of the other elements, Scripture makes no
mention, because they are less in quantity in the human body, as we
have said; and because also in the account of the Creation no mention
is made of fire and air, which are not perceived by senses of
uncultured men such as those to whom the Scripture was immediately
addressed.
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SECOND ARTICLE [I, Q. 91, Art. 2]

Whether the Human Body Was Immediately Produced by God?

Objection 1: It would seem that the human body was not produced by God
immediately. For Augustine says (De Trin. iii, 4), that "corporeal
things are disposed by God through the angels." But the human body was
made of corporeal matter, as stated above (A. 1). Therefore it
was produced by the instrumentality of the angels, and not immediately
by God.

Obj. 2: Further, whatever can be made by a created power, is not
necessarily produced immediately by God. But the human body can be
produced by the created power of a heavenly body; for even certain
animals are produced from putrefaction by the active power of a
heavenly body; and Albumazar says that man is not generated where heat
and cold are extreme, but only in temperate regions. Therefore the
human body was not necessarily produced immediately by God.

Obj. 3: Further, nothing is made of corporeal matter except by some
material change. But all corporeal change is caused by a movement of
a heavenly body, which is the first movement. Therefore, since the
human body was produced from corporeal matter, it seems that a
heavenly body had part in its production.

Obj. 4: Further, Augustine says (Gen. ad lit. vii, 24) that man's
body was made during the work of the six days, according to the
causal virtues which God inserted in corporeal creatures; and that
afterwards it was actually produced. But what pre-exists in the
corporeal creature by reason of causal virtues can be produced by
some corporeal body. Therefore the human body was produced by some
c