14. But what about the straight line? Is it not a magnitude? Possibly;
but if it be a magnitude, it is a qualified one.[391] It is even
possible that straightness constitutes a difference of the (very nature
of the) line, as line, for straightness refers solely to a line;
and besides, we often deduce the differences of "Essence" from its
qualities. That a straight line is a quantity added to a difference
does not cause its being composed of the line, and of the property of
straightness; for, were it thus composed, straightness would be its
chief difference.