The classical texts of Christianity and Zen Buddhism contain resources with potent appeal to contemporary spirituality. The 'apophatic', or 'negative', may offer a means to integrate the conservation of traditional religious practices and beliefs with an openness to experience beyond the limits of doctrine and of rational thought. Here, J.P. Williams argues for a new understanding of what is meant by apophatic theology. He demonstrates how an apophatic spirituality might inform personal and communal spiritual development, sketching out the contribution it can offer to the modern debate on theology and postmodernism, entropy, and interfaith dialogue, while developing an active theological commitment to humanity.