The Catholic nuns took vows of chastity, obedience and poverty — and, some say, an unofficial vow of humility. : The Catholic nuns took vows of chastity, obedience and poverty — and, some say, an unofficial vow of humility. Welcome to our new and improved comments, which are for subscribers only. This is a test to see whether we can improve the experience for you. You do not need a Facebook profile to participate. You will need to register before adding a comment. Typed comments will be lost if you are not logged in. Please be polite.