One God, One System charts a history of Sanskrit philosophy in the absence of an agreed-upon canon, timeline, principal thinkers, or core philosophical questions. Contrary to previous ahistorical approaches centered on unchanging 'schools', Elisa Freschi focuses on andreconstructs the intellectual figure of Veṅkaṭanātha and his philosophical and theological contribution to what we now call 'Viśiṣṭādvaita Vedānta'.

This volume explores how Viśiṣṭādvaita Vedānta as we know it now is largely a product of Veṅkaṭanātha's unique philosophical and theological contributions. He connected various texts and theories so that readers and practitioners looking at the time before Veṅkaṭanātha now recognize them as parts of a unitary whole. Once Veṅkaṭanātha's contribution is in place it is in fact easy to look back at authors before him and recognize them as pieces of the same jigsaw puzzle. Freschi presents a novel reading of Veṅkaṭanātha through focused chapters on his epistemology, ontology, soteriology, and theology, examining both the range and theoretical basis of his synthesis and methodology.