THE NATURE OF IDEAS IMPLIES AN INDIVIDUAL FORM, WHICH AGAIN IMPLIES A SUBSTRATE.
4. Granting now the existence of ideas, whose reality has been demonstrated elsewhere,[283] we must draw their legitimate consequences. Necessarily ideas have something in common, inasmuch as they are manifold; and since they differ from each other, they must also have something individual. Now the individuality of any idea, the difference that distinguishes it from any other, consists of its particular shape. But form, to be received, implies a substrate, that might be determined by the difference. There is therefore always a matter that receives form, and there is always a substrate (even in ideas, whose matter is genus, and whose form is its difference).