In Advaita Vedanta and Jnana YogaNididhyasana (Sanskrit: निदिध्यासन) is profound and repeated meditation on the mahavakyas, great Upanishadic statements such as "That art Thou", to realize the identity of Atman and Brahman. It is the fourth step in the training of a sisya (disciple), consisting of preparatory practices, listening to the teachings as contained in the sruti, reflection on the teachings, and nididhyasana.
Nididhyasana is the final step in the correct understanding of the meaning of the Mahavakyas. Classical Advaita Vedanta emphasises the path of Jnana Yoga, a progression of study and training to attain moksha. It consists of four stages:[web 1]
Samanyasa or Sampattis, the "fourfold discipline" (sādhana-catustaya), cultivating the following four qualities:[web 1]
Nityānitya vastu viveka (नित्यानित्य वस्तु विवेकम्) — The ability (viveka) to correctly discriminate between the eternal (nitya) substance (Brahman) and the substance that is transitory existence (anitya).
Ihāmutrārtha phala bhoga virāga (इहाऽमुत्रार्थ फल भोगविरागम्) — The renunciation (virāga) of enjoyments of objects (artha phala bhoga) in this world (iha) and the other worlds (amutra) like heaven etc.
Śamādi ṣatka sampatti (शमादि षट्क सम्पत्ति) — the sixfold qualities,
Uparati (the cessation of these external organs so restrained, from the pursuit of objects other than that, or it may mean the abandonment of the prescribed works according to scriptural injunctions).[note 1]
Samādhāna (the concentrating of the mind on God and Guru).
Mumukṣutva (मुमुक्षुत्वम्) — The firm conviction that the nature of the world is misery and the intense longing for moksha (release from the cycle of births and deaths).
Sravana, listening to the teachings of the sages on the Upanishads and Advaita Vedanta, and studying the Vedantic texts, such as the Brahma Sutras. In this stage the student learns about the reality of Brahman and the identity of atman;
आत्मा वा अरे द्रष्टव्यः श्रोतव्यो मन्तव्यो निदिध्यासितव्यो मैत्रेयि,
आत्मनो व अरे दर्शनेन श्रवणेन मत्या विज्ञानेनेदं सर्वं विदितम् ||
"The Self, my dear Maitreyi, should be realized – should be heard of, reflected on and meditated upon;
by the realization of the Self, my dear, through hearing, reflection and meditation, all this is known." - (Brihadaranyaka Upanishad St.II.iv.5)
Sankara explains Nididhyasana as meditation with determination. Sankara states:-
श्रुतेः शतगुणं विद्यान्मननं मननादपि |
निदिध्यासं लक्षगुणम् अनन्तं निर्विकल्पकम् ||
"Reflection (manana) is hundred times superior to listening (sravana);
meditation (nididhyasana) is hundred times superior to reflection; nirvikalpaka samadhi is infinitely superior."
According to Suresvara, Nididhyasana is the culmination of the practice of sravana and manana, which is an indirect intuition of Brahman and does not mean meditation but knowledge (vijnana) i.e. understanding the meaning of the Sruti on the basis of vacya-vacaka relation underlying the mahavakya. Suresvara states:-
ईदृगैकात्म्यसंबोधो निदिध्यासनमुच्यते ||
"Nididhyasana is so called when, instruction about the uniqueness of the Atman is justified
by (proper) reasons viz. the Sruti, (the instructions of) teachers and (one’s own) experience (of the same)."
Nididhyasana consists in acquisition of vakyarthajnana and this verse explains the purport of sunisnata.
According to Vacaspati, sravana, manana and nidihyasana are a chain of causes contributory to the knowledge of the oneness of Brahman. The Vivarna school considers sravana as the principal cause but Suresvara treats sravana and manana to be co-existent, these two culminate into nididhyasana.
According to Madhva the knowledge acquired by study ('sravana') and stabilized by reflection ('manana') is made the basis of steady contemplation ('nididhyasana'); these are the three stages of inquiry that take the form of Dhyana.Radhakrishnan has defined Nididhyasana as "the process by which intellectual conscience is transformed into a vital one there is stillness, a calm in which the soul lays itself open to the Divine".
According to Michael James, who gives an Advaita Vedanta interpretation of Ramana Maharshi, Ramana's self-enquiry is the same as Nididhyasana and atma-vichara.[web 4]