The book "The Bloody Tenth Instrument of Conscientious Persecution Discussed and Mr. Cotton's Letter Examined and Answered" is one of the most influential works of American literature written by America's First Colonist and noted Baptist theologian Roger Williams. In his book, the author discusses and offers innovative views on religious freedom and persecution for conscience in New England at the beginning of the 17th century. Roger Williams reasonedly highlights the need to separate church and state, rejecting the idea of mixing religion and politics. The book is a fundamental record in the development of the concepts of civil liberties that later took shape in the Constitution of the United States of America. "The Bloody Tenth Instrument of Conscientious Persecution Discussed and Mr. Cotton's Letter Considered and Answered" remains a relevant and researched work in the field of religious and political philosophy to this day.