30 A last tribute to the priesthood is given by the enemies of the Church. For as We have said on a previous page, they show that they fully appreciate the dignity and importance of the Catholic priesthood, by directing against it their first and fiercest blows; since they know well how close is the tie that binds the Church to her priests. The most rabid enemies of the Catholic priesthood are today the very enemies of God; a homage indeed to the priesthood, showing it the more worthy of honor and veneration.
Source: Ad Catholici Sacerdotii (Vatican.va)