xxix.); if contrary, it will be contrary to that which is in harmony with our nature, that is, contrary to what is good--in short, bad.

Nothing, therefore, can be good, except in so far as it is in harmony with our nature; and hence a thing is useful, in proportion as it is in harmony with our nature, and vice versa.

Q.E.D.
PROP.XXXII.

In so far as men are a prey to passion, they cannot, in that respect, be said to be naturally in harmony.
Proof .-- Things, which are said to be in harmony naturally, are understood to agree in power (III.

vii.), not in want of power or negation, and consequently not in passion (III.iii.