14 As We have already hinted, this sanctity and industry prepared under such conditions in due time came to produce a truly marvelous fruit. When Charles, "good laborer that he was left the convenience and splendor of the city for the field (Milan) he was to cultivate, he discharged his duties better and better from day to day. Although the wickedness of the time had caused that field to become overrun with weeds and rank growths, he restored it to its pristine beauty. In time the Milanese Church became an example of ecclesiastical discipline." He effected all these outstanding results in his work of reformation by adopting the rules the Council of Trent had only recently promulgated.
Source: Editae Saepe (Vatican.va)