For the path of knowledge and self-inquiry, the traditional foundation lies in the great Vedāntic scriptures. Foremost among these are the Upaniṣads, especially texts such as Īśa, Kena, Kaṭha, Praśna, Muṇḍaka, Māṇḍūkya, Taittirīya, Aitareya, Chāndogya, and Bṛhadāraṇyaka, which unfold the identity of Ātman and Brahman and the impermanence of name and form. Alongside them stand the Bhagavad Gītā—particularly its chapters on knowledge and self-realization—and the Brahma Sūtras, which systematize and reconcile the diverse Upaniṣadic teachings. These three together form a coherent scriptural basis for discerning the real from the unreal and for understanding the nature of consciousness.

Within this scriptural framework, the Advaita Vedānta tradition has provided a rich body of interpretive literature that serves the seeker of jñāna. Central are the commentaries of Ādi Śaṅkarācārya on the Upaniṣads, the Bhagavad Gītā, and the Brahma Sūtras, as well as his independent works such as Viveka Cūḍāmaṇi, Ātmabodha, Tattva Bodha, Aparokṣānubhūti, and Upadeśa Sāhasrī. These texts clarify key concepts like māyā, the five sheaths (pañca kośa), and the qualifications of the aspirant, and they give structured guidance on discrimination between the real and the unreal. The Māṇḍūkya Upaniṣad together with Gauḍapāda’s Kārikā holds a special place, offering a subtle analysis of waking, dream, deep sleep, and the “fourth” (turīya) as a way of revealing nonduality.

Beyond these, several supportive works deepen and illustrate the same vision of nondual knowledge. Texts such as the Aṣṭāvakra Gītā, Yoga Vāsiṣṭha, and Ribhu Gītā, as well as later Advaita compositions like Pañcadaśī, present the nature of consciousness, illusion, and liberation through dialogues, stories, and systematic exposition. Modern exponents in this stream, including Śrī Ramana Maharshi and Nisargadatta Maharaj, have articulated the same core insight in concise teachings such as “Who am I?”, “Upadeśa Sāram,” and the dialogues collected in “I Am That,” emphasizing direct self-inquiry (ātma-vicāra) over mere intellectual study.

Underlying all of these texts is a shared pedagogy and discipline. The methods of śravaṇa (listening to the teaching), manana (reflective reasoning), and nididhyāsana (deep contemplation) are repeatedly emphasized as the way to assimilate the vision of nonduality. Ethical and psychological preparation—through viveka (discrimination), vairāgya (dispassion), the sixfold virtues (śama, dama, uparati, titikṣā, śraddhā, samādhāna), and an intense longing for liberation (mumukṣutva)—is presented as indispensable. Practices such as neti-neti (“not this, not this”), contemplation of the mahāvākyas of the Upaniṣads, and sustained self-inquiry into the nature of the “I” form the living bridge between scriptural study and direct realization.