"Institutes of the Christian Religion (Vol. 2 of 2)" by Jean Calvin is a work of systematic theology first published in Latin in 1536. This seminal Protestant text covers doctrines from church sacraments to justification by faith, while vigorously challenging Roman Catholic teachings. Written initially as a defense of persecuted Protestants in France, it evolved through multiple editions into a comprehensive theological treatise. The work became a core reference for Reformed churches and inspired new forms of Christian life across Europe.