Matter thus signifies not a species of substances quite different and heterogeneous from the object of inner sense (the soul), but rather only the heterogeneity of the appearances of substances (which in themselves are unknown to us), whose representations we call external in comparison with those that we ascribe to inner sense, even though they belong as much to the thinking subject as other thoughts do; only they have in themselves this deceptive feature, that since they represent objects in space, they seem to cut themselves loose from the soul, as it were, and hover outside it; although space itself, in which they are intuited, is nothing but a representation, whose counterpart in the same quality out side