La Naissance de la tragédie
Friedrich Nietzsche, appointed professor of classical philology at Basel in 1869 at the age of 24, admired Burckhardt and attended some of his lectures. Both men were admirers of the late Arthur Schopenhauer. Nietzsche believed Burckhardt agreed with the thesis of his "The Birth of Tragedy", that Greek culture was defined by opposing "Apollonian" and "Dionysian" tendencies. Nietzsche and Burckhardt enjoyed each other's intellectual company, even as Burckhardt kept his distance from Nietzsche's evolving philosophy. Their extensive correspondence over a number of years has been published.