The Śaiva Siddhāṅta Philosophy Introduction In the books that treat of Śaivism , there is a reference to four schools, viz., the Nākulisa Pāśupata, the Śaiva, the Pratyabhijñā and the Rāseśvara. Śaiva Siddhāṅta is the philosophy of Southern Śaivism . It owes its origins to no single author. It is midway between Śankara’s Advaita and Rāmānuja’s Viśishṭādvaita. Its literature consists