Notes on Hume - A Treatise of Human Nature I.I.III
As in the first diagram, the organizing principle here is the plane of consistency.  In this section, Hume introduces a third rubric according to which a perception must be evaluated, so that any given perception must be placed in relation to all three:  idea/impression, simple/complex, and free/constrained.  The crucial thing here is that the memory is not opposed to the imagination because one is “real” and the other “isn’t”; rather, memory differs from imagination by degree, in that one corresponds precisely to a given set of impressions, whereas the other does not necessarily correspond to a given set of impressions.

Notes on Hume - A Treatise of Human Nature I.I.III

As in the first diagram, the organizing principle here is the plane of consistency.  In this section, Hume introduces a third rubric according to which a perception must be evaluated, so that any given perception must be placed in relation to all three:  idea/impression, simple/complex, and free/constrained.  The crucial thing here is that the memory is not opposed to the imagination because one is “real” and the other “isn’t”; rather, memory differs from imagination by degree, in that one corresponds precisely to a given set of impressions, whereas the other does not necessarily correspond to a given set of impressions.

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