"Neither, again, can imagination be ranked with things like knowledge or
intellect, which are always correct:  it may also be false.  It remains, then,
to consider whether it be belief, as belief may be true or false.  But belief
is attended by conviction, for it is impossible to hold beliefs without being
convinced of them:  but no beast is ever convinced, though many have
imagination.  Further, every belief implies conviction, conviction implies that
we have been persuaded, and persuasion implies reason.  Among beasts, however,
though some have imagination, none have reason."<p>
<p>
	(<i>De Anima</i>, III, 3, 428a 16 ff)