"National Apostasy Treated in a Sermon Preached at St. Mary's Church, Oxford, Before the Judges of the Royal Assizes, on Sunday, July 14, 1833," is the work of the English preacher and poet John Keeble. In his sermon, the author criticizes the apostasy of the nation's Christian values and calls for repentance and a return to faith. This work not only reflects the author's concerns about the moral crisis of society, but also inspires readers to think about the importance of faith and spiritual values. John Keeble's work is an important testament to his views on religion and society and remains relevant today.