Jean-Luc Marion's book, Negative Certainties, first published in French asCertitudes négatives in 2007, is without a doubt an important addition to hisoeuvre. The main argument can be stated briefly: Following Descartes, Kant, and Heidegger, Marion emphasizes man's finitude and the limits of reason. But, he asks, isn't it certain that we can be certain about our finitude and rational limitations? After establishing this concept of negative certainty” he then applies it to four aporia or issues of certain uncertainty: the definition of man; the nature of God; the unconditionality of the gift, understood both as that which transcends exchange and as the given; and the unpredictability of events. And this in turn leads him to further reflections on God (or Being) as the unconditioned Giver of the Gift. This book, now available in English for the first time in Stephen Lewis's elegant translation, will be essential reading for postmodern theologians and philosophers of religion in general.