Every man and woman in society has one big duty. That is, to take care of his or her own self. This is a social duty. For, fortunately, the matter stands so that the duty of making the best of one's self individually is not a separate thing from the duty of filling one's place in society, but the two are one, and the latter is accomplished when the former is done

What Social Classes Owe to Each Other (ed. Ludwig von Mises Institute, 1903) - ISBN: 9781610163057