This chapter focuses on Cotton Mather’s Bonifacius: An Essay upon the Good (1710), in which Mather makes a series of proposals for how Christians might advance the gospel cause and exercise social benevolence. For this purpose, Mather creatively amalgamated different variants of the genre. First published anonymously in 1710 but quickly associated with Mather’s name, Bonifacius has often been considered an aesthetically and intellectually inferior predecessor of the American essay tradition, rather than its first full instantiation. Even so, the work enjoyed great popularity in the United States and Britain throughout the eighteenth and nineteenth centuries. In his Autobiography, Benjamin Franklin praised Bonifacius and acknowledged its importance in his early formation. This chapter investigates that connection and explores the relation between the sermon and the essay, dwelling on significant passages from Bonifacius and tracking its influence on a number of later philosophical and spiritual traditions.