Hume, An Enquiry Concerning Human Understanding, 20-37

Hume explains that matters of fact relationships come from sensory experience or from memory. He explains cannot be a source of my knowledge and that know matters of fact about unnoticed things through cause and effect. He then discusses how the principle of cause and effect works. Cause and effect are separate from each other. From experience in the past we infer what we will experience in the future. As humans we then base our awareness of future events on past experiences. To explain this situation Hume gives us "demonstrative reasoning," which is based on relations of ideas, and "moral reasoning," or matters of fact. This presents a problem of knowing the future based solely on the past and everything we experience will begin to resemble one-another. Hume shows we suppose instances between the past and future, but there is nothing to say that we can say that this is actually what will happen or prove that it is even possible.  So the main points of this section are that our knowledge from experience is based on the principle of cause and effect.  We find that the principal of cause and effect is in the nature of induction and this relies on the uniformity principle, which says the future will take after the past and we come to know this principal through our experiences.