Abstract

The author argues that the core of Hume’s Academic skepticism lies in his commitment to an external world and objective causal powers that are cognitively opaque to human understanding. Three central topics of Hume’s theory of the understanding are discussed—the existence of absolute space, the existence of a world external to our senses, and the existence of objective causal powers. In each case, Hume draws a Pyrrhonian opposition between judgments based on his “Copy Principle” and the “fictions” or “illusions” formed through association of ideas. While he suspends judgment concerning the existence of absolute space, he argues that the association-based beliefs in an external world and objective causal powers are necessary for human life and indispensible in science. In adopting such beliefs about external reality, while at the same time denying their intelligibility, Hume was following ancient Academic skepticism.