Advaita in the context of "Sādhanā"

Dualism in Indian philosophy is a belief, or large spectrum of beliefs, held by certain schools of Indian philosophy that reality is fundamentally composed of two parts or two types of existence. This mainly takes the form of either mind-matter dualism, as in some strands of Buddhist philosophy, or consciousness-nonconsciousness dualism in the Samkhya and Yoga schools of Hindu philosophy. These can be compared and contrasted with mind-body dualism in Western philosophy of mind and metaphysics.

Another form of dualism in Hindu philosophy is found in the Dvaita ("dualism") Vedanta school, which regards God and the world as two realities with distinct essences; this is a form of theistic dualism. By contrast, schools such as Advaita ("nondualism") Vedanta embrace nondualism or absolute monism, regarding dualism as an illusion (maya).

Dvaita Vedanta (/ˈdvaɪtə veɪˈdɑːntə/); (originally known as Tattvavada; IAST: Tattvavāda), is a sub-school in the Vedanta tradition of Hindu philosophy. The term Tattvavada literally means "arguments from a realist viewpoint". The Tattvavada (Dvaita) Vedanta sub-school was founded by the 13th-century Indian philosopher-saint Madhvacharya. Madhvacharya believed in three entities: God, jiva (soul), and jada (maya, matter). The Dvaita Vedanta believes that God and the individual souls (jīvātman) exist as distinct realities. These individual souls are dependent (paratantra) on Vishnu (Narayana), who alone is independent (svatantra).

The Dvaita school contrasts with the other two major sub-schools of Vedanta, the Advaita Vedanta of Adi Shankara which posits nondualism—that ultimate reality (Brahman) and human soul (Ātman) are identical and all reality is interconnected oneness, and Vishishtadvaita of Ramanuja which posits qualified nondualism—that ultimate reality (Brahman) and human soul are different but with the potential to be identical. Sanyasis of the Dvaita Vedanta tradition belong to the ēkadaṇḍi order.

Meykandar (Tamil: மெய்கண்டார், Meykaṇṭār, lit. the truth seer), also known as Meykanda Devar, was a 13th-century philosopher and theologian who contributed to the Shaiva Siddhanta school of Shaivism. His literary work known as Śiva Jñāna Bodham (in Tamil) on Shaiva Siddhanta has enjoyed great vogue and prestige among Tamils comparable to other works of Hindu philosophy from the Advaita of Adi Shankara and Vishishtadvaita of Ramanuja.

Mandana Mishra (Sanskrit: मण्डन मिश्र, romanized: Maṇḍana Miśra; c. 8th century CE) was a Hindu philosopher who wrote on the Mīmāṃsā and Advaita systems of thought. He was a follower of the Karma Mimamsa school of philosophy and a staunch defender of the holistic sphota doctrine of language. He was a contemporary of Adi Shankara, and while it is said that he became a disciple of Adi Sankara, he seems to have been the most authoritative Advaitin until the 10th century CE. He is often identified with Sureśvara, though the authenticity of this is doubtful. Still, the official Sringeri documents recognises Mandana Mishra as Sureśvara.

Avadhuta Gita (Devanagari: अवधूत गीता, IAST: Avadhūta Gītā) is a Sanskrit text of Hinduism whose title means "Song of the free soul". The text's poetry is based on the principles of Advaita and Dvaita schools of Hindu philosophy.

The text is attributed to Dattatreya, and extant manuscripts have been dated to approximately the 9th or 10th century CE. It consists of 289 shlokas (metered verses), divided into eight chapters. The first seven chapters are the text's oldest layer, and the eighth chapter is likely a later interpolation. It may have been composed in the deccan states of India, probably Maharashtra. Avadhuta Gita has been one of the most important texts of the Natha Yogi tradition of Hinduism.

Achintya-Bheda-Abheda (अचिन्त्यभेदाभेद, acintyabhedābheda in IAST) is a school of Vedanta representing the philosophy of inconceivable one-ness and difference. In Sanskrit, achintya means 'inconceivable', bheda translates as 'difference', and abheda translates as 'non-difference'.The Gaudiya Vaishnava religious tradition employs the term in relation to the relationship of creation and creator (Krishna, Svayam Bhagavan), between God and his energies. The movement's theological founder, Chaitanya Mahaprabhu (1486–1534), is considered the philosophy's main proponent, and differentiates the Gaudiya tradition from the other Vaishnava Sampradayas. It can be understood as an integration of the strict dualist (Dvaita) theology of Madhvacharya and the monistic theology (Advaita) of Adi Shankara.