A letter to Dinet in 1642 attacked both Bourdin and Gisbertus Voetius , an opponent at the University of Utrecht .
Later , Descartes found him sympathetic enough to use as a sounding board , and potential intermediary with Pierre Bourdin , another Jesuit and critic of the Dioptrics .
A letter to Dinet in 1642 attacked both Pierre Bourdin and Gisbertus Voetius , an opponent at the University of Utrecht .
Later , Descartes found him sympathetic enough to use as a sounding board , and potential intermediary with Pierre Bourdin , another Jesuit and critic of the Dioptrics .