"Perceiving, then, is analogous to mere propounding or mere thought and, when
something is pleasant or painful, the pursuit or avoidance of it by the soul is
a sort of affirmation or negation.  In fact, to feel pleasure or pain is
precisely to function with the perceptive mean, towards good or evil as
such."<p>
<p>
	(<i>De Anima</i>, III, 7, 431a 8 ff)<p>