Summarize Hume's theory of knowledge. How do its conclusions condition Hume's treatment of causality?

The most important aspect of Hume's theory of knowledge is that it is a form of "empiricism". In other words, rather than taking the view espoused by Plato and Berkeley that knowledge is prior to experience, or accepting Locke's concept of innate ideas, Hume believes that we gain knowledge exclusively from our experience, that we start out as blank slates and use our senses to gain information about the world.

Knowledge is created by two human faculties, memory and imagination. Memory recalls sense perceptions as we have experienced them. Imagination is the faculty we use to reorder those sensations and create connections and patterns to make sense of them.

Causality, for Hume, is not something that exists "out there" in the world, but rather is a way the imagination attempts to order and make sense of its impressions.