... the Upanishads speak of jyotir brahma, the Light that is Brahman. Very often the sadhak feels a flow of Light upon him or around him or a flow of Light invading his centres or even his whole being and body, penetrating and illumining every cell and in that Light there grows the spiritual consciousness and one becomes open to all or many of its workings and realisations. Appositely I have a review of a book of Ramdas (of the Vision) before me in which is described such an experience got by the repetition of the Rama mantra, but, if I understand rightly, after a long and rigorous self-discipline. "The mantra having stopped automatically, he beheld a small circular light before his mental vision. This yielded him thrills of delight. This experience having continued for some days, he felt a dazzling light like lightning, flashing before his eyes, which ultimately permeated and absorbed him. Now an inexpressible transport of bliss filled every pore of his physical frame." It does not always come like that—very often it comes by stages or at long intervals, at first, working on the consciousness till it is ready. <ref>https://incarnateword.in/cwsa/29/bhakti-yoga-and-vaishnavism#p48</ref>
=Japa And Healing=
It is similar with this japa: an imperceptible little change, and one can pass from a more or less mechanical, more or less efficient and real japa, to the true japa full of power and light. I even wondered if this difference is what the tantrics call the 'power' of the japa. For example, the other day I was down with a cold. Each time I opened my mouth, there was a spasm in the throat and I coughed and coughed. Then a fever came. So I looked, I saw where it was coming from, and I decided that it had to stop. I got up to do my japa as usual, and I started walking back and forth in my room. I had to apply a certain will. Of course, I could do my japa in trance, I could walk in trance while repeating the japa, because then you feel nothing, none of all the body's drawbacks. But the work has to be done in the body! So I got up and started doing my japa. Then, with each word pronounced—the Light, the full Power. A power that heals everything. I began the japa tired, ill, and I came out of it refreshed, rested, cured. So those who tell me they come out of it exhausted, contracted, emptied, it means that they are not doing it in the true way. <ref>http://incarnateword.in/agenda/01/october-6-1959#p11</ref>
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This is the main reason for my japa. There's a power in the sound itself, and by forcing the body to repeat the sound, you force it to receive the vibration at the same time. But I've noticed that if something in the body's working gets disturbed (a pain or disorder, the onset of some illness) and I repeat my mantra in a certain way—still the same words, the same mantra, but said with a certain purpose and above all in a movement of surrender, surrender of the pain, the disorder, and a call, like an opening—it has a marvelous effect. The mantra acts in just the right way, in this way and in no other. And after a while everything is put back in order. And simultaneously, of course, the precise knowledge of what lies behind the disorder and what I must do to set it right comes to me. But quite apart from this, the mantra acts directly upon the pain itself. <ref>http://incarnateword.in/agenda/01/june-4-1960#p4</ref>
==Cure for Tamas==
..it is good to repeat a mantra, a word, a prayer before going into sleep. But there must be a life in the words; I do not mean an intellectual significance, nothing of that kind, but a vibration. And its effect on the body is extraordinary: it begins to vibrate, vibrate, vibrate... and quietly you let yourself go, as though you wanted to go to sleep. The body vibrates more and more, more and more, more and more, and away you go. That is the cure for tamas. <ref>http://incarnateword.in/cwm/15/4-june-1960#p6</ref>
=Mantra in Crises=