Feed the flock of God which is among you, taking care of it, not by constraint, but willingly, according to god; not for filthy lucre's sake, but voluntarily. ...And when the prince of pastors shall appear, you shall receive a never fading crown of glory.
St. Peter, First Epistle 5:2, 4, c.45
No priest of the Lord is free to be ignorant of the statutes of the Apostolic See.
St. Siricius, Letter to Bishop Himerius of Tarragona,
Now the Lord Jesus...desired that the Church, whose Bridegroom He is, should have her visage shining with the splendor of chastity....Hence all we priests and Levites are bound by the unbreakable law of those instructions to subdue our hearts and bodies to soberness and modesty from the day of our ordination, that we may be wholly pleasing to our God in the sacrifices which we daily offer.
St. Siricius, Letter to Himerius, Bishop of Tarragona,
No one does more harm to the Church than he, who having the title or rank of holiness, acts evilly.
St. Gregory I the Great, Pastoral Care, c. 590
Be zealously affected to command in all the churches the pure tradition be held.
St Agatho I, Letter to the Third Council of Constantinople,
I command you to apply yourself with more energy to preaching and enforcing the celibacy of the clergy according to the edicts of the Fathers.
St. Gregory VII, Letter to Hanno, Archbishop of Cologne,
See that the bounds of common sense are not exceeded, however, for common sense is the guide of the virtues.
Innocent IV, Quae Honorem Conditoris Omnium, October 1, 1247
Carefully investigate the directors given charge of boys and young men in seminaries and colleges, and the courses they are to follow, the teachers chosen for secondary schools, and the schools which are to be run. Keep out the ravening wolves who do not spare the flock of innocent lambs, and expel them if necessary by the way they entered.
Pius VII, iu Satis, May 15, 1800
Venerable Brethren, of what nature and magnitude is the care that must be taken by you in the forming of the clergy to holiness! All other tasks must yield to this one.
St. Pius X, E Supremi, October 4, 1903
Remember that your duty is not the extension of a human realm, but of Christ's; and remember that your goal is that acquisition of citizens for a heavenly fatherland, and not for an earthly one.
Benedict XV, Maximum Illud, 1919
The Church, to a great extent, derives Her vigor, Her apostolic zeal, and Her fervor in seeking holiness of life, from the flourishing condition of Her Religious Institutes.
Paul VI, Address to the General Chapters of
Priestly celibacy has been guarded by the Church for centuries as a brilliant jewel, and it retains its value undiminished even in our time when the outlook of men and the state of the world have undergone such profound changes.
Paul VI, Sacerdotalis Caelibatus, June 24, 1967