ititious works of St.
Augustine): "A taste of the tree of life warded off corruption of the
body; and even after sin man would have remained immortal, had he
been allowed to eat of the tree of life."

_I answer that,_ The tree of life in a certain degree was the cause of
immortality, but not absolutely. To understand this, we must observe
that in the primitive state man possessed, for the preservation of
life, two remedies, against two defects. One of these defects was the
lost of humidity by the action of natural heat, which acts as the
soul's instrument: as a remedy against such loss man was provided with
food, taken from the other trees of paradise, as now we are provided
with the food, which we take for the same purpose. The second defect,
as the Philosopher says (De Gener. i, 5), arises from the fact that
the humor which is caused from extraneous sources, being added to the
humor already existing, lessens the specific active power: as water
added to wine takes at first the taste of wine, then, as more water is
added, the strength of the wine is diminished, till the wine becomes
watery. In like manner, we may observe that at first the active force
of the species is so strong that it is able to transform so much of
the food as is required to replace the lost tissue, as well as what
suffices for growth; later on, however, the assimilated food does not
suffice for growth, but only replaces what is lost. Last of all, in
old age, it does not suffice even for this purpose; whereupon the body
declines, and finally dies from natural causes. Against this defect
man was provided with a remedy in the tree of life; for its effect was
to strengthen the force of the species against the weakness resulting
from the admixture of extraneous nutriment. Wherefore Augustine says
(De Civ. Dei xiv, 26): "Man had food to appease his hunger, drink to
slake his thirst; and the tree of life to banish the breaking up of
old age"; and (QQ. Vet. et Nov. Test. qu. 19 [*Work of an anonymous
author], among the supposititious works of St. Augustine) "The tree of
life, like a drug, warded off all bodily corruption."

Yet it did not absolutely cause immortality; for neither was the
soul's intrinsic power of preserving the body due to the tree of life,
nor was it of such efficiency as to give the body a disposition to
immortality, whereby it might become indissoluble; which is clear from
the fact that every bodily power is finite; so the power of the