The article examines the reception of the Epistola ad Ducissam Brabantiae, a moral-theological report on Jews, usury, and taxation written by Thomas Aquinas at the request of (probably) Adelaide of Burgundy, Duchess of Brabant († 1273) in the Six Books on General Christian Matters (Knížky šestery o obecných věcech křesťanských) by the Bohemian lay theologian and author of Czech religious and didactic treatises Thomas Štítný († before 1409). and Pavel Blažek.