The first part of this article argues that the centre of Martin Heidegger's thought should not be Sein but Welt and the concepts related to its disclosure. Contemporary commentators take a further step to suggest that the Welt is a "political" concept. It is in the sense that the human participants of the Welt constitute the Miteinandersein and thus a public realm is always presupposed in the background. Since the political is involved, the dimensions of ethics and worldview are also closely related issues. It is interesting that Heidegger's discussion about these in the 1930s often made use of terms with "theological" connotations, especially in Beitrdge zur Philosophie and afterwards. In spite that his rendering is not theological in traditional fashion, examination and critique from this direction may enrich the discussion. Therefore we try to get Dietrich Bonhoeffer's thought into our comparative discussion in the third part. Besides that both are immersed in the same Germ an humanistic heritage and active in the same era with academic and political involvement, Bonhoeffer's discussion on a world come of age and religionless Christianity presupposed some similar concerns with Heidegger when the world is facing challenges from modernity. Nevertheless, they have run on very different tracks eventually. In the last part, a critical correlation between Heidegger and Bonhoeffer is articulated. For Bonhoeffer, the "church" is a divine community whose subjectivity is constituted by God in Christ. Thus those who participated in this community may encounter God at present III person and IS shaped intersubjectively through the Fiireinander Sein revealed in Christ. This article suggests that this concept could be a reparative to Heidegger's Mitsein through the dialectic process of dependence and responsibility to shape the Christuswirklichkeit.