opposites exist at the same time. Which would be the case were it to
tend to several diverse objects as last ends, as has been shown above
(ad 2).
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SIXTH ARTICLE [I-II, Q. 1, Art. 6]

Whether Man Wills All, Whatsoever He Wills, for the Last End?

Objection 1: It would seem that man does not will all, whatsoever he
wills, for the last end. For things ordained to the last end are said
to be serious matter, as being useful. But jests are foreign to
serious matter. Therefore what man does in jest, he ordains not to
the last end.

Obj. 2: Further, the Philosopher says at the beginning of his
Metaphysics (i. 2) that speculative science is sought for its own sake.
Now it cannot be said that each speculative science is the last end.
Therefore man does not desire all, whatsoever he desires, for the last
end.

Obj. 3: Further, whosoever ordains something to an end, thinks of
that end. But man does not always think of the last end in all that
he desires or does. Therefore man neither desires nor does all for
the last end.

_On the contrary,_ Augustine says (De Civ. Dei xix, 1): "That is the
end of our good, for the sake of which we love other things, whereas
we love it for its own sake."