Eugene Chislenko

Hume describes his own “open, social, and cheerful humour” as “a turn of mind which it is more happy to possess, than to be born to an estate of ten thousand a year.” Why does he value a cheerful character so highly? I argue that, for Hume, cheerfulness has two aspects—one manifests as mirth in social situations, and the other as steadfastness against life’s misfortunes. This second aspect is of special interest to Hume in that it safeguards the other virtues. And its connection with the first aspect helps explain how it differs from Stoic tranquility. For Hume, I argue, philosophy has a modest role in promoting human happiness by preserving cheerfulness.

In the conclusion to the first book of the Treatise, Hume's skeptical reflections have plunged him into melancholy. He then proceeds through a complex series of stages, resulting in renewed interest in philosophy. Interpreters have struggled to explain the connection between the stages. I argue that Hume's repeated invocation of the four humors of ancient and medieval medicine explains the succession, and sheds a new light on the significance of skepticism. The humoral context not only reveals that Hume conceives of skepticism primarily as a temperament, not a philosophical view or system. It also resolves a puzzle about how Hume can view skepticism as both an illness and a cure. The skeptical temperament can, depending on its degree of predominance, either contribute to or upset the balance of temperaments required for proper mental functioning.