Numenius, who teaches that the faculty of assent (or, combining
faculty) is capable of producing various operations, says that
representation (fancy) is an accessory of this faculty, that it does
not, however, constitute either an operation or function of it, but
a consequence of it. The Stoics, on the contrary, not only make
sensation consist in representation, but even reduce representation
to (combining) assent. According to them sense-imagination (or
sense-fancy) is assent, or the sensation of the determination of
assent. Longinus, however, does not acknowledge any faculty of assent.
The philosophers of the ancient Academy (the Platonists) believe
that sensation does not comprise sense-representation, and that,
consequently, it does not have any original property, since it does
not participate in assent. If sense representation consisted of assent
added to sensation, sensation, by itself, will have no virtue, since it
is not the assent given to the things we possess.