The Catechism in Questions & Answers

595. What developments led to the efforts to reform the church?

Over the course of the Middle Ages, the church became more and more secular— faith and doctrine lost more and more of their value. This can be attributed to a lack of orientation from the gospel.
It was for this reason that an increasing number of efforts were made to reform the church. On the one hand, there were endeavours to reform the church within monasticism, and on the other hand, others like the Frenchman Peter Waldo (1140, died before 1218), the English theologian John Wycliffe (1320- 1384), and the rector of the University of Prague, John Hus (1369-1384), began to make efforts of their own. All of them were consistent critics of the secularised church. The movements initiated and supported by them affected large parts of Europe, and eventually led to the Reformation.