This is a summary of Hume's main points.

Hume starts off with saying that we have knowledge about two kinds of objects. Relations of ideas and matters of fact. The relation of ideas is about the logical world. It is not based on what happens in the world. It will always be the same. It couldn't be otherwise. Also the contrary of relations of ideas is unintelligible and contradictory. For example all married people are not divorced. If we take the contrary it …

…fact is founded on the relation of cause and effect. Hume also believes that reason is not enough for us to understand things. We also need experience to go along with reason. He brings up the example of Adam. He says that Adam did not know what to do with the water because he did not have any experiences with it. He means that cause and effect are not discoverable by reason but by experiences.