7 Nor do We propose to make this encyclical a solemn proclamation of Catholic doctrine or of moral or social principles. Our purpose is merely to send you a sincere message, as between brothers and members of a common family. We do so in fulfillment of Our duty and with no other thought in mind than to open Our heart to you and to strengthen more and more and render more joyful that union of faith and love which happily exists between us. We aim at increasingly better results from our pastoral activity, a more fruitful outcome of the sessions of the Ecumenical Council, and a clearer exposition of those doctrinal and practical rules which govern the spiritual and apostolic activity of the official rulers of the Church, their subjects, collaborators and well-wishers.
Source: Ecclesiam Suam (Vatican.va)