Martin Luther's 'The Ninety-five Theses' is a seminal work that challenged the Roman Catholic Church's practices and beliefs. Written in a bold and straightforward style, Luther's arguments are presented in the form of propositions that critique the sale of indulgences and other corruptions within the church. This work sparked the Protestant Reformation, making it a crucial text in the history of Christianity. Luther's use of vernacular language ensured that his ideas could reach a wider audience, contributing to the spread of Protestantism throughout Europe. The Ninety-five Theses remains a significant piece of religious and historical literature, showcasing Luther's courage in standing up against the powerful institution of the Church.