nd effect can relate the existence of one thing to the existence of another because it shows a connection between them and shows that their existence is dependent on each other.
Hume discusses natural principles, which state that our sensible perceptions have a continued and interrupted existence. Reflected principles reject the opinion of natural principles that there is a thing in nature as a continued existence, which occurs when it is not in contact with the senses.
The tension between these two principles is that the imagination tells us that our resembling perceptions have a continued and undisturbed existence and they do not disappear with their absence. Reflection allows the idea that even our resembling perceptions are interrupted in their existence and are differ from each other. Hume carries this further by supporting skepticism by stating that "Trivial trials of the fancy conducted by false superstitions" cannot cause a solid or rational system of determining existence. According to Hume, it is impossible for any system to defend the understanding of our senses.