( It probably doesn't help that magic is something stereotypically tied to the Romani people. To people like Javert's mother, who herself was a fortune teller. Javert has never liked that part of himself, and by extension, doesn't like anything that reminds him of it, including magic. The frown does not leave his face as he responds, calmly, )

Then that is all more reason why you should learn. You may not always be able to count on such foolish parlor tricks, but you can always count on yourself, if you possess the physical ability.