This collection of texts recalls the climate of the theological background of the Reformation in Geneva. Although there is only one among the five treatises (the Confession of Faith of 1537 by William Farel) which relates directly to the events of 1536, nevertheless all five have the same orientation. The Epistle to all lovers of Jesus Christ (1536), Calvin's Reply to Sadolet (published here with the Cardinal's Epistle), the Little Treatise on Holy Communion (1541) and the Treatise on Relics (1543) emphasise the same group of ideas. Calvin and Farel take great trouble to convince the public at large of the need for the Reformation is still not acknowledged and are engaged in putting the faithful on their guard against the abuses of the Church of Rome. Their wish is to preach "true piety", which for the Reformers means piety which depends as little as possible on any "human manufacture".