After the early death of his parents, he supported himself by the engraver's trade and the teaching of French, at the same time studying theology, in Basel, Hanau, and, after 1668, Heidelberg. At Basel he was captivated by Descartes' philosophy, which never quite lost its hold on him. He read also Thomas à Kempis and Tauler, but was especially influenced by the writings of the Dutch Mennonite mystic Hendrik Jansen van Barrefelt (Hiël) (c. 1520 - c. 1594), whose works were published under the pseudonym of Hiël.