I found the beginning of this section difficult to understand in terms of the validity of his statement. I found it interesting that one of Lewis' premises was posed in a rather hopeful manner. I think the way he stated that there is "some unified body of scientific theories" was unclear to me in how much he would be able to use evidence from this notion.

Is Lewis' description of "what we need to know" refer to the similar example of the process of moving our hands? We know how to operate our hands and cause them to move but we do not spend any thought on the specific actions that need to occur in order for the movement to take place.