In addition to Descartes, Elisabeth held correspondence with many others, including various Quakers. Among them most notably were Edward Reynolds, Nicholas Malebranche, Gottfried Wilhelm Leibniz, Robert Barclay, and William Penn. While they seemed to have the aim of converting her to their faith, Elisabeth seemed to be focused on the intellectual interest of their ideals and beliefs. She also held a correspondence for a time with the "Dutch Minerva", Anna Maria van Schurman, who encouraged Elisabeth to further her studies in history, physics, and astronomy. While their correspondence was not extensive, Van Schurman was a mentor to Elisabeth and guided her in her scholarly studies. She was respected and revered by Princess Elisabeth to a great degree. Elisabeth asked for her advice on new topics and subjects of study often. Van Schurman took the initiative in giving Elisabeth her opinion on the new discoveries of their time. The area in which they seemed to diverge was in their opinion of Descartes. Elisabeth was intrigued by the new Cartesian philosophy and wanted to learn more about it. Van Schurman, however, emphatically refuted the idea when Elisabeth inquired about it, instead defending the scholastic traditional view. As much as she respected Van Schurman, this did not stop Elisabeth from pursuing her interest in Descartes and his doctrine. It has been speculated that Elisabeth's correspondence and deep connection with Descartes effectively ended her communications with Van Schurman.