Vijnana Bhairava Tantra
111: When one whirls his body round and round and falls down swiftly on the earth, then on the cessation of the energy of commotion, there appears supreme spiritual condition.
112: Being powerless to perceive objects due to ignorance or wrong perception, if one is able to dissolve the mind by absorbing it on the erroneous perception of objects, then at the end of commotion brought about by that absorption, there the form of Bhairava appears.
113: Listen, O Devi, as I am telling you about this (mystic) tradition in its entirety. If the eyes are fixed in a steady gaze (without blinking), kaivalya (isolation) will arise immediately.
114: Contracting (or closing) the openings of the ears and also the lower opening (reproductive/excretory organs) in the same way, and then meditating on the palace of the anahad (unstruck) sound within, one enters the eternal Brahma.
115: Standing above a deep hole or well and looking steadily downward (into the abyss), the mind becomes entirely free of vikalpas and dissolution immediately manifests.