Hume's ultimate goal in his philosophic endeavors was to undermine abstruse Philosophy. By focusing on the aspect of reason, Hume shows there are limitations to philosophy. Since he did not know the limits, he proposed to use reason to the best of his ability, but when he came to a boundary, that was the limit. He conjectured that we must study reason to find out what is beyond the capability of reason.
Hume began his first examination if the mind by classifying its contents as Perceptions. "Here therefore [he divided] all the perceptions of the mind into two classes or species." (27) First, Impressions represented an image of something that portrayed an immediate relationship. Secondly, there were thoughts and ideas, which constituted the less vivid impressions. For example, the recalling of a memory. From this distinction, Hume decreed that all ideas had origin within impressions.
From the distinction of perceptions, Hume created his microscope' in order to trace all ideas back to impressions. He did this to search for the limits. If an idea could not be traced back to its impression, it was too abstruse. Hume separated the objects of human reason into two categories. First, the relation of ideas, which represented all that is a priori'. Secondly, he created the category of matters of fact. Matters of fact made up the a posteriori' piece of the spectrum of reason. Matters of fact are contingent, meaning they could be otherwise.
In order to go beyond the objects of human reason, Hume proposed that reasoning was based upon cause and effect. Causal relations help us to know things beyond our
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immediate vicinity. All of our knowledge is based on experience. Therefore, we need experience to come to causal relationships of the world and experience constant conjunction. Hume stated that he "shall venture to affirm, as a general proposition which admits no exception, that the