This stage of abstract ideas or of negative powers or forces finally becomes convinced of the essential unity of all processes and of all forces; it sets up the doctrine of the _correlation of forces_, and believes that persistent force is the ultimate truth, the fundamental reality of the world. This we may call a concrete idea, for it sets up a principle which is the origin of all things and forces, and also the destroyer of all things, and hence more real than the world of things and forces; and because this idea, when carefully thought out, proves to be the idea of self-determination——self-activity. Persistent force, as taught us by the scientific men of our day, is the sole ultimate principle, and as such it gives rise to all existence by its self-activity, for there is nothing else for it to act upon. It causes all origins, all changes, and all evanescence. It gives rise to the particular forces——heat, light, electricity, magnetism, etc.——which in their turn cause the evanescent forms which sense-perception sees as "things." We have described three phases:—— I. Sensuous Ideas perceive "things." II. Abstract Ideas perceive "forces." III. Concrete Idea perceives "persistent force." In this progress from one phase of reflection to another, the intellect advances to a deeper and truer reality[14] at each step. Sense-ideas which look upon the world as a world of independent objects, do not cognize the world truly. The next step, abstract ideas, cognizes the world as a process of forces, and "things" are seen to be mere temporary equilibria in the interaction of forces; "each thing is a bundle of forces." But the concrete idea of the Persistent force sees a deeper and more permanent reality underlying particular forces. It is one ultimate force. In it all multiplicity of existences has vanished, and yet it is the source of all particular existence. This view of the world, on the stand-point of concrete idea, is pantheistic. It makes out a one supreme principle which originates and destroys all particular existences, all finite beings. It is the stand-point of Orientalism, or of the Asiatic thought. Buddhism and Brahminism have reached it, and not transcended it. It is a necessary stage of reflection in the mind, just as much as the stand-point of the first stage of reflection, which regards the world as composed of a multiplicity of independent things; or the stand-point of the second stage of reflection, which looks upon the world as a collection of relative existences in a state of process.