At some point in the following decades, Stagel formed a collection of 28 of Suso's letters in the "Grosses Briefbuch" ("Great Book of Letters"), which survives. Suso also wrote a long text purporting to tell the story of his spiritual life and ascetic practices (variously referred to as the "Life of the Servant", "Life", "Vita", or "Leben Seuses"), and revised the "Büchlein der Wahrheit" and the "Büchlein der ewigen Weisheit". At some point in his later years, perhaps 1361–63, he collected these works, together with 11 of his letters (the "Briefbüchlein", or "Little Book of Letters", a selection of letters from the "Grosses Briefbuch"), and wrote a prologue, to form one book he referred to as "The Exemplar".