 At his father's suggestion, as a teenager he read the genetic and evolutionary works of Hugo de Vries and August Weismann and the philosophical works of Ludwig Feuerbach.In school, Hayek was much taken by one instructor's lectures on Aristotle's ethics.In his unpublished autobiographical notes, Hayek recalled a division between him and his younger brothers who were only a few years younger than him, but he believed that they were somehow of a different generation.