Umapathi Siva Chariya includes this among the best six books, required for a man to perfect himself in Tamil, namely Tiruvalluvar, with (Parimelalagar's commentary), Devaram and Tiruvachakam, Tolkapiyam, Sekkilar's Periapuranam, Sivagnana Siddhi. And there can be no doubt that he has displayed in his works all his vast learning and knowledge, and 'Siddhiar' stands out as the bulkiest and most learned contribution in the field of Philosophy in the vast Tamil and will bear comparison in that respect with the best production in Sanskrit. Arul Nandi Siva Chariya was his name after he met and was initiated by his master Meikanda Deva and his other name was Sakalagama Pandithar, which seems however not to be his real name but one conferred on him for his vast erudition and researches in the Saivite lore. He is author of another short work called 'Irupairupakthu' (இருபா இருபஃது), in which he states some of the most puzzling problems in Indian Philosophy in the form of questions addressed to his master, in such a form that the answers themselves are transparent.

The author is the second of the Santhana Achariyas in canonized Saints of the Saivas, and his date may be with more or less accuracy fixed at about 1200 A.D. Sivagnana Botham is called the 'Muthal Nul' or Revealed Book, and this work is called the 'Vazhi Nul' containing the best and the most lucid elucidation of Meikanda Deva's short and concise aphorisms. THIS is the second of the fourteen Siddhanta Sastras, and its author was the disciple of the Great Meikanda Deva and his best expender.

Sivapuranam by sivacharyar sankara