The Paramārthasāra, or ‘Essence of Ultimate Reality’, is a work of the Kashmirian polymath Abhinavagupta (tenth–eleventh centuries). It is a brief treatise in which the author outlines the doctrine of which he is a notable exponent, namely nondualistic Śaivism, which he designates in his works as the Trika, or ‘Triad’ of three principles: Śiva, Śakti and the embodied soul (nara).