Throughout his early writings, Leibniz was concerned with developing an acceptable account of God's relationship to the created world. In some of these early writings, he endorsed the idea that this relationship was similar to the human soul's relationship to the body. Though he eventually came to reject this idea, theanima mundi thesis remained the topic of several essays and correspondences during his career, culminating in the correspondence with Clarke. At first glance,Leibniz's discussions of this thesis may seem less important in comparison to others, since it might seem like a topic which is far removed from what are regarded as his most important philosophical doctrines. I hope to show in what follows that such a view is mistaken. The large amount of attention Leibniz paid to this thesis is a sure indication of its importance to him. Further, as we shall see, his discussions of this thesis tum on some of his most interesting metaphysical topics, including the development of his thinking about the actual infinite, the structure of organic wholes, and the relationship between God and the created universe. In what follows, I examine these discussions chronologically, from the De Summa Rerum (1675-6), to the correspondence with Clarke (1715-6).

It happened to me one day to say that Cartesianism, in what good it has, was only the anteroom of true philosophy. A person in the company, who frequented the court, was well read, and even had ideas about science, pressed the figure into an allegory-maybe a little too far. For, he asked me whether I didn’t think that one could say, along the same line, that the ancients led us up the staircase, that the modem school had arrived at the guards’ room, and that, if the innovators of our century had managed to reach the anteroom, he wished me the honor of introducing us into Nature’s sanctum. This parallel made us all laugh, and I told him, “You see, Sir, your comparison has rejoiced the company. But you forgot that between the anteroom and the sanctum there is the audience chamber, and that it will be enough if we obtain audience, without purporting to penetrate in the inner sanctum” (VE, p. 1867).