Arnold Geulincx (January 31, 1624 - November 1669), Flemish philosopher and logician. Professor at the University of Louvain, Belgium for 12 years, and later professor at the University of Leyden, Holland. Geulincx wrote all his works in Latin, and died before his principal books, namely Ethica and Metaphysica could be published. He summerized his philosophy as "Ita est, ergo ita sit", he believed in a "pre-established harmony," but not as Leibniz who 25 years after his death claimed such an idea to be the "best of all possible worlds." Rather Geulincx meant that it was sufficient for what he saw as a mankind far from perfection.