Unigenitus Dei Filius

Unigenitus (named for its Latin opening words Unigenitus dei filius, or "Only-begotten son of God"), an apostolic constitution in the form of a papal bull promulgated by Pope Clement XI in 1713, opened the final phase of the Jansenist controversy in France. Unigenitus condemned 101 propositions of Pasquier Quesnel as:

false, captious, ill-sounding, offensive to pious ears, scandalous, pernicious, rash, injurious to the Church and its practices, contumelious to Church and State, seditious, impious, blasphemous, suspected and savouring of heresy, favouring heretics, heresy, and schism, erroneous, bordering on heresy, often condemned, heretical, and reviving various heresies, especially those contained in the famous propositions of Jansenius.

In 1671 Pasquier Quesnel had published a book entitled Abrégé de la morale de l'Evangile ("Morality of the Gospel, Abridged"). It contained the four Gospels in French, with short explanatory notes, serving as aids for meditation. The work was approved by the bishop of Châlons-sur-Marne. Enlarged editions followed, containing an annotated French text of the complete New Testament, in 1678 and 1693–1694. This last edition was highly recommended by the new bishop of Châlons, Louis Antoine de Noailles. While the first edition of the work contained only a few Jansenist points, its tendency became more apparent in the second edition, and in its complete form, as it appeared in 1693, it was – in the words of the 1912 Catholic Encyclopedia – "pervaded with practically all the errors of Jansenism".

Several bishops forbade it to be read, and Clement XI condemned it in a brief, July 13, 1708, which was, however, not accepted in France, because its wording and its manner of publication were not in harmony with the accepted prerogatives of the Gallican church. Noailles, who had become Archbishop of Paris and cardinal meanwhile, and who in 1702 discarded a relic that had long been venerated at Châlons as the umbilical cord of Jesus, was not prepared to withdraw the approbation which he had given to the book, and Jansenism again raised its head.

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