Librería Samer Atenea
Kálamo Books
Librería Elías (Asturias)
Librería Kolima (Madrid)
Librería Proteo (Málaga)
Erasmus infers from the style and language of this piece, that it is not St. Augustine’s, putting it in the same category with the treatises On Continence, On substance of Charity, On Faith of things invisible.