The Jesuit takes religious vows which are apostolic. He commits himself until death to the evangelical counsels of poverty, chastity and obedience. This is so that he may be totally united to Christ and share his own freedom to be at the service of all God’s people. And so, the Jesuit formalizes this commitment, by public vows of poverty, chastity and obedience.
In binding the Jesuits, the vows set them free:
Moreover, following Ignatius they have asked Christ our Lord to let them render this service in a manner that gives them a personality of their own. They have chosen to give it in the form of a consecrated life, placing themselves at the service not only of the local churches but of the universal church, by a special vow of obedience to his who presides over the universal church, namely, the pope.