"The saying attributed to Zeno by Cicero{6} that Perception is like the fingers extended, that Assent is like the half-closed hand, that Apprehension is like the hand fully closed, and that Knowledge (Scientia) is like the closed hand firmly grasped by the other hand, would seem to attribute to knowledge a superiority over sense-perception. On closer examination, however, it is seen that the difference is only a difference of degree."