Kant lays out his view in the first ten sections. Everything begins with force. It is even prior to extension, as Leibniz had already said (#1; 1:17). Here Leibniz is right, Kant thinks, and praises him for having shed light on the Aristotelian concept of the entelechy, and Leibniz’s recovery of the basis for substantial forms. Yet Leibniz does not go far enough. Nature’s units are active forces (#1–3; 1:17–18). Their action is constructive; they make and sustain the fabric of nature. The world is a tapestry of energy concentrations. Forces rule everything, not only bodily motions (#2; 1:18.6–8), but all activities (#3; 1:18.27–36). This includes mind-body interaction—materially produced ideas and mentally intended actions (#6; 1:20.35–21.1; 21.14–16).