He was the author of a manual of Thomistic philosophy, once widely used in Roman Catholic seminaries.
Grenier's Cursus Philosophiae was originally written in Latin, and was then translated into French and English.
Gavan Monaghan called the publication of the Cursus "a milestone in the teaching of thomistic philosophy.
"[1] The Thomist praised the Cursus for adhering faithfully to "the mind and teaching of St. Thomas and Aristotle.
"[2] Along with Charles De Koninck and Louis Lachance, Grenier was a prominent Thomist critic of personalism.