Ethan Kleinberg writes that, more than Husserl, it was Martin Heidegger who appealed to Sartre's sense of radical individualism. He says, "for Sartre, the question of being was always and only a question of personal being. The dilemma of the individual confronting the overwhelming problem of understanding the relationship of consciousness to things, of being to things, is the central focus" of "Nausea". Eventually, "in his reworking of Husserl, Sartre found himself coming back to the themes he had absorbed from Heidegger's "Was ist Metaphysik?"" Nausea was a prelude to Sartre's sustained attempt to follow Heidegger's "Sein und Zeit" by analyzing human experience as various ontological modes, or ways of being in the world.