This article provides an update on the logic undergirding Karl Rahner’s theology of mystery through a dialogue between Rahner and Jean-Luc Marion. It focuses on Rahner’s account of truth in Aquinas and Marion’s Gifford Lectures on revelation. Marion’s distinction between “alethic” (modern-epistemological) and “apocalyptic” (phenomenological-Christian) logics elucidates anew Rahner’s commitment to mystery as deep, abiding truth. Also addressed is Marion’s Balthasarian concern about Rahner and “anticipation,” expressed as criticism of the “anonymous Christian.” The article aims to encourage future, robust theological reflection on truth, an always timely endeavor.