§1. Apostolic action belongs to the very nature of institutes dedicated to works of the apostolate. Accordingly, the whole life of the members is to be imbued with an apostolic spirit; indeed the whole apostolic action is to be informed by a religious spirit.
§2. Apostolic action is to proceed always from an intimate union with God and is to confirm and foster this union.
§3. Apostolic action, to be exercised in the name and by the mandate of the Church, is to be carried out in the communion of the Church.
Source: Code of Canon Law (Vatican.va)