44 Theologians and preachers, however, when treating these and like questions concerning the Blessed Virgin, must avoid straying from the correct course, with a twofold error to guard against: that is to say, they must beware of unfounded opinions and exaggerated expressions which go beyond the truth, on the other hand, they must watch out for excessive narrowness of mind in weighing that exceptional, sublime, indeed all but divine dignity of the Mother of God, which the Angelic Doctor teaches must be attributed to her "because of the infinite goodness that is God."
Source: Ad Caeli Reginam (Vatican.va)