The historic Shaiva Siddhanta literature is an enormous body of texts. The tradition includes both Shiva and Shakti (goddess), but with a growing emphasis on metaphysical abstraction. Unlike the experimenters of Atimarga tradition and other sub-traditions of Mantramarga, states Sanderson, the Shaiva Siddhanta tradition had no ritual offering or consumption of "alcoholic drinks, blood or meat". Their practices focussed on abstract ideas of spirituality, worship and loving devotion to Shiva as SadaShiva, and taught the authority of the Vedas and Shaiva Agamas. This tradition diversified in its ideas over time, with some of its scholars integrating a non-dualistic theology.