He was director for twenty-three years of a famous sodality of men connected with the professed house of the Jesuits in Paris, and was also a successful preacher.
Crasset is the author of many ascetical works, among which are: He also published in 1689 a "Historie de l'eglise du japon" which has been translated into several languages but which is considered inferior to that of Charlevoix.
Crasset's history was unoriginal, for it was drawn in great part from the work which François Solier had issued in 1627; he retouched the style and continued the narrative from 1624 to 1658, but with crowded details.
There is a posthumous work of his entitled "La foy victorieuse de l'infidélite et du libertinage".
On 9 September 1656, the Bishop of Orléans issued an interdict against him for having in one of his sermons charged several ecclesiastics with sustaining the propositions condemned by the Bull of Pope Innocent X, "Cum occasione" (31 May 1653).