23 That same honor, liberty, and purity of the Church is ever in his mind; he yearns for it with sighs, prayers, sacrifices; he works for it with all his might both in vigorous resistance and in manly patience; and he defends it by his acts, his writings, his words. He recommends it in language strong and sweet to his brethren in religion; to the bishops, the clergy, and to all the faithful; but with more of severity to those princes who outraged it to the great injury of themselves and their subjects.
Source: Communium Rerum (Vatican.va)