The article presents a critical approach to „Filozofia” Jaspersa [ Jaspers’ „Philosophy”] by Mirosław Żelazny (WN UMK, Toruń 2019). It discusses the main theses presented in the dissertation and invites to reflection on the existential philosophy of Karl Jaspers. The paper exposes the most important themes of Jaspersian thinking — the dialectical method of philosophizing, understanding the worldview, the phenomenon of existential communication and the concept of borderline situations.