§1. When the period of temporary incorporation has elapsed, a member is able to leave the institute freely or the major moderator, after having heard the council, can exclude a member for a just cause from the renewal of the sacred bonds.
§2. For a grave cause, a temporarily incorporated member who freely petitions it is able to obtain an indult of departure from the supreme moderator with the consent of the council.
Source: Code of Canon Law (Vatican.va)