In the Apostolic Letter "Multiformis Sapientia Dei", Saint Paul VI writes: "... as our predecessor Gregory XV’s decree bestowed upon her the honours of the saints so that all the faithful of Christ might understand with what abundance God had filled his servant with the Holy Spirit, so should we proclaim her — we do not doubt — a Doctor of the Church, first among women, especially for her knowledge and doctrine of divine things." Read here an excerpt from this Apostolic Letter.