Book 1, Part 2, Of The Ideas of Space and Time Summary and Analysis

There is a problem with 1.1 though. We have ideas of space and time that do not fit neatly into Hume's categories, so Hume focuses on them in 1.2. Hume will not comment on the nature of space and time, only on our ideas of space and time. Since all ideas come from impressions, the idea of space must come from an impression as well. We get the idea of space from arrays of objects that extend over an area and then extent that idea far beyond our senses. Simple impressions can be representations of having 'extension' and so the idea of extension becomes the idea of space.

There are no simple impressions of time, only an idea. The idea is generation from the succession of perceptions...