old and new so that old and new come to resemble each other. In this connection the mistake, serious for the historian, is often made of describing the attitude and ideals of the sixteenth century fraters with the aid of statements by persons over a hundred years dead, as though no change or development had taken place. The Brothers in their heyday, in the middle of the fifteenth century, were different men from Geert Groote, although his biographers described his life as they thought it must have been. The sixteenth century fraters were retiring, somber men who lived quietly in their houses or contentedly near the Sisters, while others worked in their hostels helping the boys who attended the city schools. The fact has often been ignored that the first Humanists had already acquired their new convictions before the Brothers had any school of note.
It is our intention here to examine those facts which have some bearing on these questions and to describe our conclusions. These facts must be sought in the history of the individual monasteries and Brotherhouses, which must, however, be viewed not separately but as a whole.
This book is based chiefly upon the data derived from the sources. In indicating the general literature I have thus confined myself to references to J.M.F. Dols, Bibliographie van de Moderne Devotie, Nijmegen 1941, and W. Jappe Alberts, Zur Historiografie der Devotio Moderna und ihrer Erforschung, Westfalische Forschungen XI (1953) 51-67. Other references are given for the individual foundations.
A difficult task was to define the limits of our subject. Given the fact that the Modern Devotion was a distinctive movement and was so referred to by its supporters in that period, it must be possible to define its boundaries both in time and place. It had a beginning and an end and extended over a particular territory. In this book the Modern Devotion is taken to be that late medieval ecclesiastic and religious movement, begun in the year 1379 by Geert Groote and moving through various channels - the Brethren and Sisters of the Common Life and the canons of the Congregation of Windesheim - into the sixteenth century and beyond, but losing much of its vitality after 1600. Anything falling outside these channels is not dealt with here, even though there is sometimes a connection with the Devotionalists. In the first place we do not discuss the German mystics and John Ruusbroec, except insofar as they influenced Geert Groote or the origin and development of the Modern Devotion. We also ignore the history of the Dutch Tertiaries, both men and women, whose origin