A Jesuit who lived and taught for more than 50 years in Japan shows how Christian theology today must dialogue with modern science and with Eastern religions. Mystical Theology provides a working model of such a dialogue, as Johnston engages Einstein's theories as well as Zen Buddhism. It becomes clear how the science of love as mysticism is called, cannot be an esoteric discipline, for monks and nuns alone. In Johnston's writing the mystical aspects of our faith become accessible to all modern people who grappling with the problems of our age.