What we may know, according to Hume, is a causal connection, or an understanding of the connection between an event, a, and apparent cause, b. That is not the same as the logical syllogism "if a then b" however, for we cannot, as humans perceive of our senses the moment of causality between the two events a and b. This forms the basis of Hume's argument and may be expanded and clarified by understanding that what we view as causes may be more adequately understood as an impression of necessary relation that does not itself constitute an actually necessary relation between events. This serves as the natural limit of human understanding in Hume's …show more content…
They are mental functions which 'make sense' out of our disparate perceptions by organizing them into the form in which we experience the world. The categories in unison form 'the understanding' - the faculty for making empirical judgments. Finally, the categories are 'pure' concepts, in the sense that they are not as Hume had claimed, derived from experience, but have their origin in the very constitution of the mind itself.
The judgment that A is not merely joined to B (by always preceding it) but actually causes B is grounded in an a priori source of knowledge - ie in the faculty of the understanding with its a priori conditions of objective knowledge. It is because the judgment is so grounded a priori, that we are entitled to assert the principle of causality: that all events of type A are universally and necessarily followed by events of type