stylistic:style_transfer, structural:scholar_edition, linguistic:voice_change
Vedas and Principal Upanishads

The Vedas and Upanishads are shared scriptures of Hinduism, while the Agamas are sacred texts of specific sub-traditions. The surviving Vedic literature can be traced to the 1st millennium BCE and earlier, while the surviving Agamas can be traced to 1st millennium of the common era. The Vedic literature, in Shaivism, is primary and general, while Agamas are special treatise. In terms of philosophy and spiritual precepts, no Agama that goes against the Vedic literature, states Mariasusai Dhavamony, will be acceptable to the Shaivas. According to David Smith, "a key feature of the Tamil Saiva Siddhanta, one might almost say its defining feature, is the claim that its source lies in the Vedas as well as the Agamas, in what it calls the Vedagamas". This school's view can be summed as,

The Veda is the cow, the true Agama its milk.

The Śvetāśvatara Upanishad (400–200 BCE) is the earliest textual exposition of a systematic philosophy of Shaivism.