In Advaita Vedanta and Jnana Yoga Nididhyasana (Sanskrit: निदिध्यासन) is profound and repeated meditation[1] on the mahavakyas, great Upanishadic statements such as "That art Thou", to realize the identity of Atman and Brahman.
Classical Advaita Vedanta emphasizes the path of Jnana Yoga, a progression of study and training to attain moksha.
[7] Yajnavalkya tells his wife – Adi Shankara took a subitist stance, stating that hearing the mahavakyas directly leads to insight, without the need for nididhyasana.
The Vivekacudamani, incorrectly attributed to Shankars, states: According to Madhva the knowledge acquired by study ('śravaṇa') 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.
[11] 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".