The significance of God, cause, number, substance or soul consists, as James asserts, in nothing but the tendency of the given concept to make us act or think. If the world should reach a point at which it ceases to care not only about such metaphysical entities but also about murders perpetrated behind closed frontiers or simply in the dark, one would have to conclude that the concepts of such murders have no meaning, that they represent no 'distinct ideas' or truths, since they do not make any 'sensible difference to anybody.