In light of Martin Heidegger's contextualized influence upon them, John Macquarrie, Rudolf Bultmann, Paul Tillich, and Karl Rahner engage in theologies that, in their respective tasks and scopes, venture into existential theology, following Heideggerian pathmarks toward the primordiality of being on the way to unconcealment, or ""aletheia."" By way of each pathmark, each existential theologian assumes a specific theological stance that utilizes a...