Introduction

Marin Mersenne (1588–1648) was a mathematician, musician, and natural philosopher. However, his main contribution to the philosophy and science of his day was his indefatigable promotion of scientific activity. Educated at the Jesuit College of La Flèche (which Descartes also attended), he entered the order of the Minims, and from his cell at their convent near the Place Royale in Paris, he acted as the center of a vast correspondence network, bringing together notable philosophers, mathematicians, and scientists. He championed the new science, publishing translations (or paraphrases) of Galileo's early mechanics and his Two New Sciences. Moreover, he served as Descartes' link to the learned world while Descartes lived in the Netherlands, assisting in the publication of Descartes' works, soliciting the Objections to the Meditations (except for the First Set of Objections), and composing the Second and Sixth Set of Objections. Among his early works were two short religious tracts, L'usage de la raison and L'analyse de la vie sprituelle (both 1623), a massive commentary on Genesis, Quaestiones in Genesim (1623), and two hefty philosophical treatises, L'impieté des deistes (1624) and La vérité des sciences (1625). The first of the two religious tracts was rediscovered in 1978, but the second remains lost. Mersenne intended the two religious works as contributions to the extremely popular early modern literary genre of devotional exercises, to be placed alongside those of Saint Ignatius of Loyola, Eustachius a Sancto Paulo, and Saint François de Sale.