The Formula Of The Institute

"Whoever desires to serve as a soldier of God beneath the banner of the cross in our society, which we desire to be designated by the name of Jesus, and

to serve the Lord alone and the Church, his spouse, under the Roman pontiff, the vicar of Christ on earth, should, after a solemn vow of perpetual chastity, poverty and obedience, keep what follows in mind. He is a member of a Society founded chiefly for this purpose:

to strive especially for the defense and propagation of the faith and for the progress of souls in Christian life and doctrine, by means of public preaching, lectures, and any other ministration whatsoever of the word of God and further by means of the Spiritual Exercises, the education of children and unlettered persons in Christianity and the spiritual consolation of Christ's faithful through hearing confessions and administering the other sacraments. Moreover, he should show himself ready to reconcile the estranged, compassionately assist and serve those who are in prisons or hospitals and, indeed, to perform any other works of charity, according to what will seem expedient for the glory of God and the common good."

.
(The Formula of the Institute is the foundational document of the Society of Jesus. It was first approved in 1540 by Pope Paul III, and confirmed in 1550 by Pope Julius III) Link (here)