This article is based on the sermons of the moderate Puritan minister Richard Culverwell, preached in his parish of St Margaret Moses, London, from the mid-1620s to the early 1630s, and recorded in detail by one of his leading parishioners, the fishmonger John Harper. It uses this material to discuss the reception of demanding Calvinist divinity, and to contribute to scholarly debates on the nature and impact of the Laudian regime in London. Although Culverwell continued to preach a Calvinist message, his sermons show a process of adaptation to changing times, and reveal the constraints and tensions that he was facing.