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Sant Sundar Das says:
In front of the eyes and nose [at the ajna chakra, in between the eyebrows] there lives Brahman (the Divine Being) whose nature is imperishable. At this juncture [with concentrated vision] the light emerges naturally.
Sant Kabir Sahab says:
Keep your mind focused while invoking the Divine name without even opening your mouth. Close the gate of your eyes and open the gate within.
Swami Shiv Narayana describes the technique this way:
Sit in Padma asana (crosslegged) and restrain your consciousness current (your attention) from going outward, while focusing your eyes in front of the nose, then you will ascend to Trikuti (the Three worlds of mind and matter).
Saint Gulal says:
Turn inward. See in your heart that the light pervades within.
Maharishi Mehi Paramhans says:
Unite the vision of both eyes by focusing on one point. Looking within, hear the divine sound. Search within in this way.
The Yoga of Vision and the experience of the divine light which follows from this practice are not only found in the Vedic scriptures. The transition from darkness to the light is described in both the Koran and the Bible.
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