This article examines a previously unnoticed link between the Puritan John Burgess and the Calvinist conformist George Hakewill. In 1604 Burgess preached a court sermon so outspoken and critical of James i's religious policy that he was imprisoned. Nearly twenty years later, however, Hakewill chose to incorporate extended passages from Burgess's sermon into the series of sermons, King David's vow (1621), preached to Prince Charles's household. This article considers why Burgess's sermon became so resonant for Hakewill in the early 1620s and also demonstrates how Hakewill deliberately sought to moderate Burgess's strident polemic. In so doing the article provides important new evidence for the politically attuned sermon culture at Prince Charles's court in the early 1620s and also suggests how, as the parameters for clerical conformity shifted in the latter years of James's reign, Calvinist conformists found a new appeal in the works of moderate Puritans.