Ineffabilis Deus (Latin for "Ineffable God") is an apostolic constitution by Pope Pius IX. It defines the dogma of the Immaculate Conception of the Blessed Virgin Mary. The document was promulgated on December 8, 1854, the date of the annual Solemnity of the Immaculate Conception, and followed from a positive response to the encyclical Ubi primum.
During the reign of his predecessor, Pope Gregory XVI, the bishops in various countries began to press for a definition as dogma of the teaching of Mary’s immaculate conception. Pius then appointed a commission to study the matter; in 1849, in the encyclical Ubi primum, he solicited the opinions of the bishops.
Hence, to demonstrate the original innocence and sanctity of the Mother of God, not only did they frequently compare her to Eve while yet a virgin, while yet innocence, while yet incorrupt, while not yet deceived by the deadly snares of the most treacherous serpent; but they have also exalted her above Eve with a wonderful variety of expressions.
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The decree surveys the history of the belief in Christian tradition, citing its roots in the long-standing feast of the Conception of Mary as a date of significance in the Eastern and Western churches. It also cites the approval of Catholic bishops worldwide who were asked in 1849 to offer their opinion on the matter.
The dogmatic statement is expressed near the end of the document:
We declare, pronounce, and define that the doctrine which holds that the most Blessed Virgin Mary, in the first instance of her conception, by a singular grace and privilege granted by Almighty God, in view of the merits of Jesus Christ, the Savior of the human race, was preserved free from all stain of original sin, is a doctrine revealed by God and therefore to be believed firmly and constantly by all the faithful.
"Mary's privilege ... was the result of God's grace and not of any intrinsic merit on her part", which is reflected in the decree. In this Pius followed the reasoning of John Duns Scotus. "The Perfect Redeemer, must in some case, have done the work of redemption most perfectly, which would not be, unless there is some person, at least, in whose regard, the wrath of God was anticipated and not merely appeased." The 1964 Dogmatic Constitution, Lumen gentium noted the view prevalent "...among the Fathers whereby they called the mother of God entirely holy and free from all stain of sin, as though fashioned by the Holy Spirit and formed as a new creature."
- "CATHOLIC LIBRARY: Ineffabilis Deus (1854)". www.newadvent.org. Retrieved 2020-11-16.
- "Pius IX's Ineffabilis Deus (Defining the Immaculate Conception) | EWTN". EWTN Global Catholic Television Network. Retrieved 2020-11-16.
- Ineffabilis Deus Papal Encyclicals Online. Retrieved December 7, 2012
- "The Immaculate Conception of the B.V.M." iBenedictines. 8 December 2011. Retrieved 2020-12-11.
- Pope Pius IX, "Ubi primum", February 2, 1849, PapalEncyclicals.net
- Richert, Scott R. "Immaculate Conception" About.com: Catholicism. Retrieved December 7, 2012.
- INEFFABILIS DEUS (The Immaculate Conception), Pope Pius IX
- Encyclopædia Britannica, Immaculate conception.
- Oakes, Edward T., Infinity Dwindled to Infancy, Wm. B. Eerdmans Publishing, 2011 ISBN 9780802865557
- "The Life of Bl. John Duns Scotus", Marian Friary of Our Lady Queen of the Seraphic Order
- Pope Paul VI, Lumen Gentium, §56