Jaspers held Kierkegaard and Nietzsche to be two of the most important figures in post-Kantian philosophy. In his compilation, "The Great Philosophers" ("Die großen Philosophen"), he wrote: "I approach the presentation of Kierkegaard with some trepidation. Next to Nietzsche, or rather, prior to Nietzsche, I consider him to be the most important thinker of our post-Kantian age. With Goethe and Hegel, an epoch had reached its conclusion, and our prevalent way of thinking – that is, the positivistic, natural-scientific one – cannot really be considered as philosophy." Jaspers also questions whether the two philosophers could be taught. For Kierkegaard, at least, Jaspers felt that Kierkegaard's whole method of indirect communication precludes any attempts to properly expound his thought into any sort of systematic teaching.