This chapter is archivally based: it lays out three broad traditions of thinking about prayer that were developed across the eighteenth century and inherited by the Romantics, drawing on sermons, essays, polemics, guides to prayer, and other genres of religious print culture. The mainstream tradition, associated with Anglicanism, is ‘reasonable devotion’, which attempts to give a pragmatic account of prayer as a duty and a discipline of self. Elements of this were extended in the rationalist tradition, which attempted to exorcise the archaic and supernatural overtones of prayer and ended up challenging some of its key elements (e.g. address to God, petition). Finally, the Evangelical Revival espoused an emotionally intense, transformational idea of prayer as the soul’s most fundamental voice of joy and despair. The chapter concludes by reviewing prayer, as an idea, on the cusp of the Romantic era.