He tells the Empiricists and Deists that they have made reason far too broad giving it far more power than it really has. He also claimed that the Deist argument that God is found in nature is not based on reason, but it is based on the very syllogistic reasoning that Newton was fighting against. Hume's main concern was to expose the limitations of reason and to explain how we make the judgements we do, in the absence of the illusory support of reason. Hume, famous for his skepticism about metaphysics as well, argued that human nature places limits on our capacity for skepticism. Logic and Metaphysics Hume divides the contents of the mind into Impressions and Ideas .
Impressions are things like sensations, passions, and emotions.
Therefore, for Hume, the impression is basest part of experience, yet the purest. Ideas are representations of those initial impressions. Hume refused to take any idea for granted. He was convinced that all communication must be based on clarity. Hume claims that this is not due to reason.