CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 927–931

927 All religious, whether exempt or not, take their place among the collaborators of the diocesan bishop in his pastoral duty. From the outset of the work of evangelization, the missionary "planting" and expansion of the Church require the presence of the religious life in all its forms. "History witnesses to the outstanding service rendered by religious families in the propagation of the faith and in the formation of new Churches: from the ancient monastic institutions to the medieval orders, all the way to the more recent congregations."
928 "A secular institute is an institute of consecrated life in which the Christian faithful living in the world strive for the perfection of charity and work for the sanctification of the world especially from within."
929 By a "life perfectly and entirely consecrated to [such] sanctification," the members of these institutes share in the Church's task of evangelization, "in the world and from within the world," where their presence acts as "leaven in the world." "Their witness of a Christian life" aims "to order temporal things according to God and inform the world with the power of the gospel." They commit themselves to the evangelical counsels by sacred bonds and observe among themselves the communion and fellowship appropriate to their "particular secular way of life."
930 Alongside the different forms of consecrated life are "societies of apostolic life whose members without religious vows pursue the particular apostolic purpose of their society, and lead a life as brothers or sisters in common according to a particular manner of life, strive for the perfection of charity through the observance of the constitutions. Among these there are societies in which the members embrace the evangelical counsels" according to their constitutions.
931 Already dedicated to him through Baptism, the person who surrenders himself to the God he loves above all else thereby consecrates himself more intimately to God's service and to the good of the Church. By this state of life consecrated to God, the Church manifests Christ and shows us how the Holy Spirit acts so wonderfully in her. And so the first mission of those who profess the evangelical counsels is to live out their consecration. Moreover, "since members of institutes of consecrated life dedicate themselves through their consecration to the service of the Church they are obliged in a special manner to engage in missionary work, in accord with the character of the institute."