Letters from Sri Ramanasramam, by Suri Nagamma

They must occur to a person as a result of the maturity of
his mind. Those that are able to do that antara sravana
(hearing inwardly) do not have any doubts.”
Whenever any one asked what those antara sravanas are,
he used to say, “Antara sravana means the knowledge of that
Atma which is in the cave of the heart always illuminated with
the feeling ‘aham, aham’ (‘I, I’), and to get that feeling to be in
one’s heart is manana, and to remain in one’s self is nididhyasa.”
In this connection, it is worth while remembering the
sloka written by Bhagavan bearing on this subject. In that sloka
mention is made not only to Atma sphurana but also how to
secure it. Securing means only remaining in one’s own self.

ùdyk...hrmXye kevl< äümaÇm!,
ýhmhimit sa]adaTmêpe[ Éait,
ùid ivz mnsa Svm! icNvta m3⁄4ta va,
pvncln raexadaTminóae Év Tvm!.

Brahman is glowing lustrously in the middle of the cave
of the Heart in the shape of the Self, always proclaiming
‘I am, I am’. Become an Atmanishta, a Self-realised person,
either by making the mind absorbed in the search of the
Self or by making the mind drown itself through control
of the breath.