 Assumes we are born as if with a blank slate or white paper. All knowledge is learned from experience.  No innate knowledge  Ergo., no a priori necessity.

 Descartes uses the notion of an innate idea of god to argue that there is a physical world  Without this argument Berkeley is able to argue that a physical world of Matter introduces an unneeded complexity provided that we can rely on law like regularity.  The challenge is to affirm Matter while denying innateness.

 Locke argues that innateness is false  Assuming perceptual experience, representation and recombination is enough to infer matter.  Primary – extension, solidity, time  Secondary – color, smell, etc.

 Certainty is relative. Absolute certatianty is unnecessary.  General terms & names – define concepts via conventions and grammar. Perception is to ideas as Motion is to objects, i. e., not essential merely an operation.

 Locke is the Modern father of empiricism, the notion that knowledge can be arrived at through sensory experience and induction.  Deductive reasoning is secondary and parasitic on knowledge gained from sensory experience.