The fact that this so-called quotation appears in exactly the same ENGLISH wording in hundreds of google entries, all without any indication of its source, ought to raise the alarm. In fact, it comes from a book published in 1908, a fanciful “biography” of Hypatia in volume 10 of “Little Journeys” by Elbert Hubbard, again without any source. There does not seem to be any trace of it before Hubbard, who evidently invented it.
You can find Hubbard’s chapter here: < There is nice hatchet job here: <