hat,_ Acts conducing to an end must be proportioned to the
end. But no act exceeds the proportion of its active principle; and
hence we see in natural things, that nothing can by its operation
bring about an effect which exceeds its active force, but only such
as is proportionate to its power. Now everlasting life is an end
exceeding the proportion of human nature, as is clear from what we
have said above (Q. 5, A. 5). Hence man, by his natural endowments,
cannot produce meritorious works proportionate to everlasting life;
and for this a higher force is needed, viz. the force of grace. And
thus without grace man cannot merit everlasting life; yet he can
perform works conducing to a good which is natural to man, as "to
toil in the fields, to drink, to eat, or to have friends," and the
like, as Augustine says in his third Reply to the Pelagians
[*Hypognosticon iii, among the spurious works of St. Augustine].

Reply Obj. 1: Man, by his will, does works meritorious of everlasting
life; but as Augustine says, in the same book, for this it is
necessary that the will of man should be prepared with grace by God.

Reply Obj. 2: As the gloss upon Rom. 6:23, "The grace of God is life
everlasting," says, "It is certain that everlasting life is meted to
good works; but the works to which it is meted, belong to God's
grace." And it has been said (A. 4), that to fulfil the commandments
of the Law, in their due way, whereby their fulfilment may be
meritorious, requires grace.

Reply Obj. 3: This objection has to do with the natural end of man.
Now human nature, since it is nobler, can be raised by the help of
grace to a higher end, which lower natures can nowise reach; even as
a man who can recover his health by the help of medicines is better
disposed to health than one who can nowise recover it, as the
Philosopher observes (De Coelo ii, 12).
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SIXTH ARTICLE [I, Q. 109, Art. 6]

Whether a Man, by Himself and Without the External Aid of Grace, Can
Prepare Himself for Grace?

Objection 1: It would seem that man, by himself and without the
external help of grace, can prepare himself for grace. For nothing
impossible is laid upon man, as stated above (A. 4, ad 1). But it is
written (Zech. 1:3): "Turn ye to Me . . . and I will turn to you."
Now to prepare for grace is nothing more than to turn to God.
Therefore it seems that man of himself, and without the external help
of grace, can prepare himself for grac