No anchorite, by my advice, shall make profession, that is, vow to keep any thing as commanded, except three things, that is, obedience, chastity, and constancy as to her abode; that she shall never more change her convent, except only by necessity, as compulsion and fear of death, obedience to her bishop or superior; for, whoso undertaketh any thing, and promises to God to do it as his command, binds herself thereto, and sinneth mortally in breaking it, if she brake it wilfully and intentionally.