 HRT allows us to discover causal relations. We may observe spatiotemporal contiguity, temporal precedence, and that a certain type of event is generally followed by another type of event. Upon repeated observation of an invariable pattern of succession, we begin to expect that this particular event of a certain type is followed by that particular event of a certain type. We develop an inferential habit due to the experienced constant conjunction of types. Or as Hume puts it: