About Aṭṭhakavagga and Pārāyanavagga

The Aṭṭhakavagga and the Pārāyanavagga are two small collections of suttas within the Pāli Canon of Theravada Buddhism. They are among the earliest existing Buddhist literature, and place considerable emphasis on the rejection of, or non-attachment to, all views.
Nāgārjuna (right) and Āryadeva (middle).

Madhyamaka – Buddhist philosophy and practices

Madhyamaka also known as Śūnyavāda and Niḥsvabhāvavāda refers to a tradition of Buddhist philosophy and practice founded by the Indian philosopher Nāgārjuna. The foundational text of the Mādhyamaka tradition is Nāgārjuna's Mūlamadhyamakakārikā. More broadly, Madhyamaka also refers to the ultimate nature of phenomena and the realization of this in meditative equipoise. According to the classical madhyamaka thinkers, all phenomena () are empty (śūnya) of "nature," a "substance" or "" (svabhāva) which gives them "solid and .