Reformers such as Jan Hus and Martin Luther are seen as original thinkers that started a movement. Calvin was a great logician. He organised a movement. He was not so much an innovator in doctrine. Calvin knew the writings of the early Church Fathers and the great Medieval schoolmen very well. Earlier Reformers also influenced him. Calvin did not disagree with the Scholastics of the Middle Ages completely. He used them and adapted their thoughts according to his understanding of the Bible.