He believed all that mother church taught (Joinville, p. 10), but he cautioned Joinville against disputing with infidels.
"L'omme lay (said he in his old language) quand il ot medire de la loy Crestienne, ne doit pas deffendre la loy Crestienne ne mais que de l'espée, dequoi il doit donner parmi le ventre dedens, tant comme elle y peut entrer" (p. 12).