He was an elegant and powerful preacher in his day, and became one of the leaders of his denomination. He was Moderator of the Association in the North (1952), and of the General Assembly (1959). He delivered the Davies Lecture in 1942, which was published in 1946 under the title Datblygiad a Datguddiad. He was chief editor of Y Cyfarwyddwr (1929-30), and an assistant editor of the same journal 1931-44. He was also editor of Y Goleuad (1949-57). He was secretary of the committee which prepared the Welsh ‘short confession of faith’, and the book of services, Llyfr gwasanaeth (1958). He was a member of the committee for the new Welsh translation of the Bible, and of the Council and Court of governors of the University College, Bangor. He contributed articles to Y Geiriadur Beiblaidd (1926), and to The Dictionary of Welsh Biography. He published two novels, Helynt Coed y Gell (1928) and Helynt Ynys Gain (1939), and a number of other books: Paul y cenhadwr (1925), Rhai o gymeriadau'r Hen Destament (1927), Y Groes (1943), The Wonderful Life (1941), Ffynnon Bethlehem (1948), and a biography of Helen Rowlands (see below; 1961). During his last years he composed and translated many hymns, and published a collection of them, Odlau'r Efengyl, in 1959. Chapters of his autobiography appeared in Y Goleuad, and during the year of his death they were published under the title Cofio'r blynyddoedd. Despite all this activity his compositions as a preacher and author were always polished.