The book describes the development of religious thought in Wales between 1760 and 1900. Although the emphasis is on religious thought, it also includes much on social history including industrialisation, popular Nonconformity, revivalism, the interest in foreign missions and the stirrings of social radicalism.

D. Densil Morgan is a professor emeritus of theology in the University of Wales Trinity Saint David and a former professor of theology at Bangor University.