He was already dying when there appeared the book Frequente Communion, by M.Arnauld, youngest son and twentieth child of that illustrious family of Arnaulds in whom Jansenism seemed to be personified.

The author was immediately accused at Rome, and buried himself for twenty years in retirement.

M.de St.Cyran was still working, dictating Christian thoughts and points touching death.
_Stantem mori oportet_ (One should die in harness), he would say.

On the 3d of October, 1643, he succumbed suddenly, in the arms of his friends.
"I cast my eyes upon the body, which was still in the same posture in which death had left it," writes Lancelot, "and I thought it so full of majesty and of mien so dignified that I could not tire of admiring it, and I fancied that he would still have been capable, in the state in which he was, of striking with awe the most passionate of his foes, had they seen him." It was the most cruel blow that could have fallen upon the pious nuns of Port-Royal.

"_Dominus in coelo!_ (Lord in heaven!)" was all that was said by Mother Angelica Arnauld, who, like M.de St.
Cyran himself, centred all her thoughts and all her affections upon eternity.
With his dying breath M.de St.Cyran had said to M.Gudrin, physician to the college of Jesuits, "Sir, tell your Fathers, when I am dead, not to triumph, and that I leave behind me a dozen stronger than I." With all his penetration the director of consciences was mistaken; none of those he left behind him would have done his work; he had inspired with the same ardor and the same constancy the strong and the weak, the violent and the pacific; he had breathed his mighty faith into the most diverse souls, fired with the same zeal penitents and nuns, men rescued from the scorching furnace of life in the world, and women brought up from infancy in the shade of the cloister.