In the raja yoga philosophy of Sankaracharya, Atmadhyana
is the fourteenth of the stages necessary to acquire the knowledge
of the unity of the soul with Brahman. It is characterized
as the condition of highest joy arising from the belief of the
identification of the self (Atman) with Brahman.
Mishra, Shri Ramamurti. Self Analysis and Self Knowledge.
Lakemont, Ga. CSA Press, 1977.