David Hume writes "All belief of matter of fact or real existence is derived from some object, present to the memory or the senses, and a customary conjunction between that and some other object." What does Hume mean here? In what way, if any, does this view differ from the ordinary conception of how we understand knowledge of cause and effect?
Simply stated; Hume contended that because we, as humans, live and live only in the present, we only know the past in terms of what we have seen happen before and we only know the future in surmise. Because of being locked into the present we cannot determine if any portion of our experience involves cause and effect or for that matter, any other arrangement whatsoever. Thus we can only assume a 'customary conjunction in events'. This resulted in his famous 'skepticism' in the possibility of human knowledge.