...unded in and justified by sense experience?
- Hume argues that all a priori knowledge is of relations to ideas, and so analytic. All knowledge of synthetic propositions, matters of fact, is a posteriori. It depends either on present experience or causal inference, which relies on past experience.
- Our knowledge of matters of fact that relies on induction can only be probable, never proven.
- Some rationalists, for example, Descartes, try to show that we can use a priori intuition and deductive argument to demonstrate what exists.
- The core of the idea of rational intuition is that you can 'see' the truth of a claim just by thinking about it.
- Descartes argues that sense experience on its own cannot establish what exists - how can we know that all sense experience is not a deception, caused by an evil demon?
- He argues that he cannot doubt his own existence, and that the mind can exist without the body.
- Descartes argues for the existence of the physical world by first arguing for the existence of God. From God not being a deceiver, it follows that our sense experience - in general - can't be completely mistaken, so the physical world exists.
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