English summary: Among the numerous coevals of the 15th century who were eager to improve the condition of the church and the world, Nicholas of Cusa (1401-1464) is certainly one of the most interesting ones. He dedicated most of his lifetime to reforming, the marks of his activites being considerable: the Concile of Basle, his legation in Germany, his years as a bishop of Brixen, the foundation of a hospital in Kues, and his reform proposals...