1830 10 In June, Marx entered Trier Middle School. After graduating from high school, he entered Bonn University, and after 18, he transferred to Berlin University to study law, but most of his studies focused on philosophy. 1840, the new king of Prussia, Frederick William IV, acceded to the throne, persecuted the liberal Democrats, and demanded that all publications must be strictly examined, so the university lost its academic freedom. Professor F. W.von Shelling of Berlin University appointed by the new king will examine Marx's doctoral thesis, but the position that philosophy is higher than theology in Marx's doctoral thesis cannot be accepted by anti-Hegelian professors, so Marx changed his doctoral thesis to Jena, Saxony-Weimar-Eisenach. 184 1 year, Marx applied for a degree with his thesis "The Difference between democritus's Philosophy of Nature and Epicurus' Philosophy of Nature", which was unanimously passed by the Committee, and without further defense, he successfully obtained a doctorate from Jena University.