"Our experience of physical objects and substances provides a further basis for understanding—one that goes beyond mere orientation." (#60 470)

"Understanding our experiences in terms of objects and substances allows us to pick out parts of our experience and treat them as discrete entities or substances of a uniform kind." (#60 471)

"Once we can identify our experiences as entities or substances, we can refer to them, categorize them, group them, and quantify them—and, by this means, reason about them." (#60 472)