Read the link I posted to the other fellow, the “secrets of the Rosary” is a church endorsed book. I learned of its existence from Pope Benedict. Presumably, you also might believe in the Fatima apparitions, where Rosary keeping is spoken of as necessary for healing and other graces, and supposedly can bring about great world changes, since God wants people to be devoted to Mary’s “Immaculate Heart.”
DOGMATIC TEACHING, Cite a DOGMATIC TEACHING. Catholics are NOT required to say the rosary.