A French metaphysician, born in Paris; determined to embrace a monastic life, entered the congregation of the Oratory at the age of 22, and devoted himself to theological study, till the treatise of Descartes on "Man" falling into his hands, he gave himself up to philosophy; his famous work "De la Recherche de la Vérité" was published in 1673, the main object of which was to bridge over the gulf which separates mind from matter by the establishment of the thesis that the mind immediately perceives God, and sees all things in God, who in Himself includes the presumed irreconcilable antithesis (1638-1715).