John Calvin was a French theologian, pastor, and reformer in Geneva during the Protestant Reformation. He is the father of the Reformed tradition and the author of the Institutes of the Christian Religion, a foundational work of systematic theology that shaped the development of Reformed orthodoxy across Europe. ^[raw/en/wcf-intro.md]
Calvin was born at Noyon, France, and studied at the universities of Paris, Orléans, and Bourges. A sudden conversion around 1533 led him to break with the Roman Catholic Church. After a period of wandering, he settled in Geneva, where he was persuaded by François Farel to aid the Reformation cause. He would remain in Geneva (with one brief exile) until his death in 1564, preaching, teaching, and writing.
His Institutes of the Christian Religion (first published in 1536, with later expanded editions) became the definitive textbook of Reformed theology. Calvin's commentaries cover nearly every book of the Bible, and his systematic thought shaped the Puritan movement, the Scottish Reformation, and evangelical theology worldwide. ^[raw/en/wcf-ch01-s01.md]
Calvin's teaching on the authority and clarity of Scripture was foundational for the Westminster Confession. He argued that Scripture is autopiston — self-authenticating — needing no external validation from the church. ^[raw/en/wcf-ch01-s04.md]
"Nothing can be more absurd than the fiction that the power of judging Scripture is in the Church, and that on her nod its certainty depends."
Calvin articulated the doctrine of the testimonium internum Spiritus Sancti — the internal witness of the Holy Spirit — according to which our full persuasion of Scripture's divine authority comes from the Spirit bearing witness by and with the Word in our hearts. ^[raw/en/wcf-ch01-s05.md]
On the clarity of Scripture, Calvin insisted that God speaks in such a way that His people can understand what is necessary for salvation. He wrote: "Let this be a firm principle: God does not speak from heaven in order to involve us in perplexity, but to lead us to a certain knowledge of Himself." ^[raw/en/wcf-ch01-s07.md]
Calvin devoted much of the Institutes to the doctrine of the Trinity and the attributes of God. He described the universe as a "theatre of God's glory" and insisted that the knowledge of God and the knowledge of ourselves are inseparably intertwined. ^[raw/en/wcf-ch01-s01.md]
His treatment of the Trinity in Book I of the Institutes follows an "economic" approach — tracing the persons through the works of creation, redemption, and sanctification — while maintaining the full equality of the three persons of the Godhead. ^[raw/en/wcf-ch02-s03.md]
On divine providence and predestination, Calvin argued powerfully that God ordains whatsoever comes to pass, yet without being the author of sin. His treatment of these doctrines in the Institutes shaped the Reformation's recovery of biblical sovereignty. ^[raw/en/wcf-ch03-s01.md]
Calvin's influence extends far beyond those who bear his name. Through his Institutes, his commentaries, his preaching, and the academy he established in Geneva, he shaped the theological character of the Reformed churches and provided the doctrinal foundation upon which later figures like Thomas Watson, A.A. Hodge, B.B. Warfield, and the Westminster Assembly would build.