In 1789 he was elected a member of the states-general by the clergy of the bailliage of Peronne, and from the first proved to be the most able and persevering defender of the ancien regime, although he had drawn up the greater part of the cahier of the clergy of Peronne, which contained a considerable programme of reform.
Espousing the principles of the Revolution in 1789, he was commissioned by the noblesse of the province to draw up the cahier (statement of principles and grievances); and the senechaussee of Montpellier elected him deputy to the states-general of Versailles; but the election was annulled on a technical point.
Etude sur l'authenticite du cahier du roi (Paris, 1897, reprinted from the Revue historique, vol.
Father Cahier would even trace the book to Tatian, and it is true that that heresiarch mentions a writing of his own upon animals.
In 1789 he drew up the first article of the cahier of the electors of the bailliage of Roye, demanding the abolition of feudal rights.
In every bailliage and senechaussee each estate drew up its own cahier and the cahiers of the Third Estate were condensed from separate cahiers drawn up by each parish in the district.