Louis-Isaac Lemaistre de Sacy

Louis-Isaac Lemaistre de Sacy (29 March 1613 – 4 January 1684), a priest of Port-Royal, was a theologian and French humanist.

In 1638, when his older brothers Antoine and Simon gave up their careers to retire to Port-Royal, Louis-Isaac joined them to take care of his education.

After his release, Louis-Isaac devoted much of his time to revising his translation, and drafting the Commentaires that he wanted to accompany each of the books of the Bible.

There followed the translation of Guyart des Moulins, composed in the late 13th century and printed in 1488, and then that of René Benoît, published in Paris in 1566, with marginal notes but which was censored as containing certain Calvinist "heresies".

This system of logic proposed to apply mathematical reasoning to other fields of knowledge and thought, including the syntactic and grammatical elements of all statements of language, offering an ideal of a rational language which could reconcile the spirit of finesse and the spirit of geometry: the discourse par excellence.