How then arise these affections common to the soul and the body? Shall
we then say that desire derives from the desire-appetite,[293] anger
from the anger-appetite, or in short, every emotion or affliction from
the corresponding appetite? But even so, they will not be common, and
they will belong exclusively to the soul, or to the body. There are
some whose origin needs the excitation of blood and bile, and that the
body be in some certain state which excites desire, as in physical
love. On the contrary, however, the desire of goodness is no common
affection; it is an affection peculiar to the soul, as are several
others. Reason, therefore, does not allow us to consider all affections
as common to soul and body.