perfected. But happiness is a perfection of man. Therefore happiness
is something belonging to man. But it is not something belonging to
the body, as shown above (A. 5). Therefore it is something belonging
to the soul; and thus it consists in goods of the soul.

_On the contrary,_ As Augustine says (De Doctr. Christ. i, 22), "that
which constitutes the life of happiness is to be loved for its own
sake." But man is not to be loved for his own sake, but whatever is
in man is to be loved for God's sake. Therefore happiness consists in
no good of the soul.

_I answer that,_ As stated above (Q. 1, A. 8), the end is twofold:
namely, the thing itself, which we desire to attain, and the use,
namely, the attainment or possession of that thing. If, then, we speak
of man's last end, it is impossible for man's last end to be the soul
itself or something belonging to it. Because the soul, considered in
itself, is as something existing in potentiality: for it becomes
knowing actually, from being potentially knowing; and actually
virtuous, from being potentially virtuous. Now since potentiality is
for the sake of act as for its fulfilment, that which in itself is in
potentiality cannot be the last end. Therefore the soul itself cannot
be its own last end.

In like manner neither can anything belonging to it, whether power,
habit, or act. For that good which is the last end, is the perfect
good fulfilling the desire. Now man's appetite, otherwise the will,
is for the universal good. And any good inherent to the soul is a
participated good, and consequently a portioned good. Therefore none
of them can be man's last end.