“Kapidvaja” – At the time of Kriya, the tongue needs to be inverted and brought above through the nasal-orifice, cross the mucus membrane and it’s tip should be kept in a slightly tilted position towards the left side (this automatically tilts) ; and this state of the sãdhaka is called Kapidvaja, the flag or banner with a monkey.
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If you really wish to eliminate the causal world, then shake off this cowardice and bring "Pa" and Ãjnã Chakra to a concentric thread (that is, putting them in alignment), then by experimenting with Shãmbhavi, Kuta is penetrated, and with just a subtle strike of Prãna, the seed is also penetrated or burnt and does not sprout again. Thus, with a "Thokar" (strike/ knock) of breath, the mind becomes dead and this leads to the Chaitanya Samãdhi (Conscious Absorption).
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Commentary: The five senses are always externally oriented. These senses need to be internalized (by reverting the tongue, by gazing upwards, and by a maintaining a straight posture, etc.) - by all these means the mind is internalized
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While focusing within the kutastha steadily, offering the oblation of prana with Atma-Mantra (The Prana Yagna is also called Aantar Yoga - Internal sacrifice) and mind becomes introvert and enchanted with melodious bumble-bee sound and then amrita starts dripping from sahasrara. The amrita (sudha) is to be offered by raising the tip of the tongue into the vaishwanara as instructed by Sri Gurudeva. Verily this is called Yagna.
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Commentary: I am Brahman and Brahman is everything. Verily, this determined conviction is themost pure (visuddha) knowledge in this world. The state obtained by keeping the head, neck and torso in proper alignment, turning the tongue upwards, pressing teeth to teeth while prana enters in the center between the eyebrows is indeed called Tapa (penance).
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With the power of pranayama, when the tri-union flame is visible at the spot of meditation and that light is visible at the spot of meditation, the Sadhaka shall leave his Prana performing Thokkar Kriya as directed by Sri Gurudeva. This is the period of six months. When becoming one with Brahman, there is no return. Verily, this is called Uttaraayana (Ut + Tar + Ayan). There is no other higher destiny than this.
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Sadhaka raises his tongue and enters the nasal cavity, behind the epiglottis, and reaches behind the nasal cavity and penetrates the sinus cavity and finally reaches to the Brahmarandhra – the fountain of nectar of immortality. The Amrita drips from there and reaches to pingala. By preventing the Amrita from entering to pingala, and by pressing the front of the tongue with teeth, one can perceive the abode of Yoni. From that abode of Yoni, it unites with the Lingam - the fountain of nectar from where the Amrita keeps flowing. This ambrosia, with the support of the tongue, drips into the stomach and into the fire of universe (Vaishvanara).
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For success in sadhana, one has to undertake or solemnize various karmas such as first kriya, second kriya, third kriya etc. as imparted by Sri Gurudeva.