There are many commonalities between the Siddhas and the Naths in terms of their ideology. Both penned poetry in the language of the common man. Both emphasized leading a simple life, rooted in nature. Both rejected Brahmanism and the Varna system. Both talked of a pure heart and firm mind. To this end, both used Yog, Dhyan and Samadhi. Both are part of the Buddhist tradition, says Kanwal Bharti