The Iconoclastic controversy was undoubtedly one of the major conflicts in the history of the Christian Church. It was not just a Byzantine conflict; the West was also involved in the dispute. It is true, however, that the West never followed the East in the theological argument, nor did it suffer all the implications and consequences of the Byzantine theology of the Icons. In the history of the Christian East it was, on the contrary, a turning point. All levels of life were affected by the conflict, all strata of society were involved in the struggle. The fight was violent, bitter, and desperate. The cost of victory was enormous, and tensions in the Church were not solved by it. The Church in Byzantium has never recovered again her inner unity, which had been distorted or lost in the Iconoclastic strife.

The story of the Kingdom movement of the 1890's is one of the most important chapters in the history of American social Christianity. In the middle years of the 1890's the Christian social movement really began to exert significant influence upon the American Protestant churches and to modify the character of certain denominations. The Kingdom movement played an important role in the events of these crucial years.

This bibliographical review of works on Ulrich Zwingli is partial evidence of a quarter-century of considerable scholarly activity directed toward the history of the continental Reformed churches. At first glance, the memorial volumes commemorating the 400th anniversary of the Zurich Reformation (1519–1919) and of the Reformer's death at Kappel (1531–1931) would seem to account for the inordinate number of Zwingli studies since 1918; but an equal volume of scholarship devoted, without such promptings, to Martin Bucer, or the Weber Thesis, or the Reformation in the Netherlands confirms the trend toward intrested historical inquiry, stimulated perhaps by the return to the mainstream of Reformation thought.