The marriage of those who have been baptized is, in addition, invested with the dignity of a sacramental sign of grace, for it represents the union o… - Paul VI

Priestly celibacy has been guarded by the Church for centuries as a brilliant jewel, and retains its value undiminished even in our time when the outlook of men and the state of the world have undergone such profound changes.

De propaganda prole quaestio, non secus atque quaelibet quaestio humanam vitam attingens, ultra particulares alias eiusdem generis rationes - cuiusmodi eae sunt, quae biologicae aut psychologicae, demographicae aut sociologicae appellantur

it is not admissible to ordain women to the priesthood, for very fundamental reasons. These reasons include: the example recorded in the Sacred Scriptures of Christ choosing his Apostles only from among men; the constant practice of the Church, which has imitated Christ in choosing only men; and her living teaching authority which has consistently held that the exclusion of women from the priesthood is in accordance with God's plan for his Church.