“Why are these historical observations interesting?...they suggest that we should be careful about attributing our distinction between philosophy and science to earlier thinkers…The examples I have given do raise an interesting question: Why is it that we tend to see such a radical break between philosophy and science, and, more important, should we? The question can be raised directly, without the need for history, as Quine has done. But history brings the point home in an especially clear way: It shows us an assumption we take for granted by pointing out that it is not an assumption everyone makes.”