Abstract

John Locke thought that the clearest idea of active power derives from observing the mind's command over its ideas and limbs; observing the transfer of motion in impact also gives us an idea of active power. Berkeley denied this latter claim: the (related) idea of causation is derived exclusively from the experience of willing ideas, of volitional activity; the concept of causality has no legitimate extension beyond spirits and their volitions. The malleability of empiricist theories of meaning, whether in the eighteenth or twentieth century, enables Berkeley and Hume to advance opposing, empiricist theories of causation. Demonstrative knowledge is possible where "nominal" and "real" essences coincide. Empiricism about meaning did have a deep impact on Hume. This chapter discusses the role of empiricism about meaning in Berkeley. Berkeley subscribed to a Cartesian metaphysics of mind. Berkeley's Cartesian theory of mind is set within an occasionalist metaphysics.