Many would argue that a true understanding of contemporary Christian thought is impossible without a basic understanding of John Calvin's contributions. What details do we know about John Calvin's life? What were some of his most important contributions? What relevance did and does his work have for the Presbyterian Church (U.S.A.)? What do we know about John Calvin's theology? What about his understanding of God, the Holy Spirit, and the importance of prayer? How important was predestination to Calvin? You'll find the answers to these questions in this study.