influential in shaping Heidegger's thought. Almost all central concepts of Being and Time are derived from Augustine, Luther, and Kierkegaard, according to Christian Lotz. Augustine viewed time as relative and subjective, and that being and time were bound up together. Heidegger adopted similar views, e.g. that time was the horizon of Being: ' ...time temporalizes itself only as long as there are human beings.' Aristotle and the Greeks Heidegger was influenced at an early age by Aristotle, mediated through Catholic theology, medieval philosophy and Franz Brentano. Aristotle's ethical, logical, and metaphysical works were crucial to the development of his thought in the crucial period of the 1920s. Although he later worked less on Aristotle, Heidegger recommended postponing reading Nietzsche, and to "first study Aristotle for ten to fifteen years". In reading Aristotle, Heidegger increasingly contested the traditional Latin translation and scholastic interpretation of his thought. Particularly important (not least for its influence upon others, both in their interpretation of Aristotle and in rehabilitating a neo-Aristotelian "practical philosophy") was his radical reinterpretation of Book Six of Aristotle's Nicomachean Ethics and several books of the Metaphysics. Both informed the argument of Being and Time. Heidegger's thought is original in being an authentic retrieval of the past, a repetition of the possibilities handed down by the tradition. The idea of asking about being may be traced back via Aristotle to Parmenides. Heidegger claimed to have revived the question of being, the question having been largely forgotten by the metaphysical tradition extending from Plato to Descartes, a forgetfulness extending to the Age of Enlightenment and then to modern science and technology. In pursuit of the retrieval of this question, Heidegger spent considerable time reflecting on ancient Greek thought, in particular on Plato, Parmenides, Heraclitus, and Anaximander, as well as on the tragic playwright Sophocles. According to W. Julian Korab-Karpowicz, Heidegger believed "the thinking of Heraclitus and Parmenides, which lies at the origin of philosophy, was falsified and misinterpreted" by Plato and Aristotle, thus tainting all of subsequent Western philosophy. In his Introduction to Metaphysics, Heidegger states: Among the most ancient Greek thinkers, it is Heraclitus who was subjected to the most fundamentally un-Greek misinterpretation in the course of Western history, and who nevertheless in more recent times has provided the strongest impulses toward redisclosing what is authentically Greek. Charles Guignon wrote that Heidegger aimed to correct this misunderstanding by reviving Presocratic notions of 'being'