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The aim of pranayama having been achieved, thereafter the practices of pancha dharana, dhyana and finally, samadhi, are perfected and nishpatti avastha attained. Swami Sivananda states, "A yogic student will automatically experience all these avasthas one by one, as he advances in his systematic, regular practices. An impatient student cannot experience any of these avasthas through occasional practices."
Practice of nadi shodhana Nadi shodhana is a complete practice in itself and, as stated in the scriptures, can lead to the experience of kevala kumbhaka and samadhi. However, the diligence of a sadhaka is required to arrive at this state. In texts such as Shiva Samhita, the various remarkable stages following the practice of nadi shodhana presume such a calibre of the aspirant. These scriptures were written by highly accomplished yogis, who actually described their advanced practices. Nevertheless, the practice of nadi shodhana will give substantial benefits to an average practitioner as well.
As a daily practice, nadi shodhana may be used to vitalize the pranic energies, release pranic blockages and achieve a balance between the sympathetic and parasympathetic nervous systems, so that life's situations can be handled better. As a therapeutic tool, it can be applied for almost all physical and mental disorders, although this must be done under expert guidance. For those who wish to use nadi shodhana as a spiritual practice, it may indeed awaken the dormant shakti and direct it through sushumna, the path of spiritual awakening, leading to deep states of meditation.
The practice is presented here in three parts, beginning, intermediate and advanced. Proper advice should be obtained before commencing any of these levels. As with all techniques, each stage should be mastered before proceeding to the next, so that the duration of inhalation, exhalation and retention can be controlled without strain and without the need to take extra breaths in between rounds. One should not be alarmed by the long ratios of the advanced level.
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