Q.E.D.
PROP.XV.

Desire arising from the knowledge of good and bad can be quenched or checked by many of the other desires arising from the emotions whereby we are assailed.
Proof .-- From the true knowledge of good and evil, in so far as it is an emotion, necessarily arises desire (Def.

of the Emotions, i.), the strength of which is proportioned to the strength of the emotion wherefrom it arises (III.

xxxvii.).

But, inasmuch as this desire arises (by hypothesis) from the fact of our truly understanding anything, it follows that it is also present with us, in so far as we are active (III.