This section is from the "May I Answer That?" book, by Sri Swami Sivananda. Also available from Amazon: May I Answer That?
Your spiritual Samskaras are not yet strong. You are not yet moulded properly. You need Satsang for one year more. You should repeat 200 Malas of any Mantra daily (200 x 108 = 21,600 times). You should take Sattvic food only, such as rice, Dhal, bread, fruits and milk. Give up meat at once. Observe Mouna for two hours daily. Live alone for two hours in a room. Introspect. Meditate. Watch your thoughts carefully.
Hari Singh was a Hatha Yogi. He was buried underneath the ground in a box for three months in Ranjit Singh's court. He came back with life when the box was opened. Hatha Yogis block the Talu Chakra, the posterior nasal openings, with their elongated tongue that is obtained through Bahir Kechari Mudra Kriya of Chalan (moving the tongue frequently), Doshan (dragging the tongue with butter) and Chedan (cutting the frenulum lingua that is underneath the tongue). They drink slowly the nectar that dribbles from the Sahasrara Chakra through the opening in the palate. This instance of Hari Singh clearly indicates that the real "I" is entirely distinct from Prana. In spite of the suspension of breath, Hari Singh had continuity of consciousness.
If you want to become a Master of Arts, it takes a large number of years. You will have to pass through the Matriculation, Intermediate and B.A. courses and then take up the M.A. course. Even so, you will have to plod on and persevere for many years to remove the Mala and the Vikshepa. How patiently does the fisherman wait with concentrated gaze to catch a single fish! When such is the case for a trifling thing, what to speak of attaining Brahma-Jnana? It is Kshurasya Dhara, walking along the blade of a sharp razor.
An ordinary worldly-minded man can hardly hear the inner voice of Atma. He cannot get pure thoughts of Vichara also. Any Sattvic thought emanates from the Sattvic Buddhi. In the case of worldlings, all thoughts emanate from the mind only. He who does Nishkama Karma Yoga and has purity of mind begins to entertain thoughts of God. Generally the mind raises various sorts of curious, fantastic thoughts. It deludes all. It may pretend to do Vichar. When it comes to practicality, it will do nothing. If there is serious determination in you to concentrate and meditate, and if you put it into actual practice for months steadily and if the longing for the Darshan of God or Self-realization becomes keen and acute, then alone think that all these kinds of thoughts proceed from your Sattvic Buddhi only.
 
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