experiences into two categories: impressions and
             ideas. Ideas are memories of sensations claimed Hume, but impressions are the cause of the
             sensation. In other words impression is an actual vivid perception which as Hume says, brings
             negative or positive beliefs in the existence of a corresponding objective reality. The idea is
             an element derived from the impression, and hence it is less vivid than the impression, it is a
             copy which the impression leaves behind. For example: It id on
             ...