- Schopenhauer, Arthur (12)
- Heidegger, Martin (11)
- Gurisatti, Giovanni (8)
- Huizing, Klaas (4)
- Keyserling, Hermann (4)
- Schmitt, Carl <1888-1985> (3)
- Hofmann, Werner <1928-2013> (1)
- Jünger, Ernst (1)
- Kris, Ernst (1)
- Lavater, Johann Caspar (1)
- Spengler, Oswald (1)
- Taubes, Jacob (1)