§1. Each institute, attentive to its own character and purposes, is to define in its constitutions the manner in which the evangelical counsels of chastity, poverty, and obedience must be observed for its way of living.
§2. Moreover, all members must not only observe the evangelical counsels faithfully and fully but also arrange their life according to the proper law of the institute and thereby strive for the perfection of their state.
Source: Code of Canon Law (Vatican.va)