 He united philosophical introspection with the study of the History of Philosophy in a personalized manner.He was interested in ancient history, the Middle Ages, the Modern era, traditional Arab and Jewish philosophies, as well as ideas from India, studying the differences between philosophy and tradition.Among Western traditions, he was particularly interested in the platonic and neoplatonic traditions, in Meister Eckhart, in Solomon Ibn Gabirol, and in Leibniz.