Pastor Schulz had hoped the university student Kant would pursue a church career, but instead he took courses in logic, ethics, metaphysics, natural law, and mathematics. Martin Knutzen (1713–1751), Kant’s advisor, introduced him to the Principia (1687) and the Optics (1704), and probably led him to think about natural philosophy. Additionally, Kant attended classes with Johann Gottfried Teske (1704–1772), whose courses on electricity and experimental physics would inspire Kant’s doctoral dissertation De Igne or Meditations on Fire (1755).