His works mainly dealt with the problem of the original, given world (Lebenswelt), its structure and the human position in it. He tried to develop this basically Husserlian concept under the influence of some core Heideggerian themes (e.g. historicity, technicity, etc.) On the other hand, he also criticised Heideggerian philosophy for not dealing sufficiently with the basic structures of being-in-the-world, which are not truth-revealing activities (this led him to an appreciation of the work of Hannah Arendt). From this standpoint he formulated his own original theory of "three movements of human existence": 1) receiving, 2) reproduction, 3) transcendence. He also translated many of Hegel's and Schelling's works into Czech.