 Arnauld’s Descartes, however, is unlike the Descartes who is seen as the father of the enlightenment and who anticipated many of the preoccupations of recent analytical philosophy. Arnauld claims to set forth the gist of Descartes’ philosophy, but he did not hesitate to replace parts of Descartes’ philosophy with different though related propositions, especially when doing so made Descartes a more reliable ally in what Arnauld took to be his primary task, to defend the truths of the faith.