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Śrīmad-Bhāgavatam
[Canto 3, Ch. 6]
potency of the Lord. The eight inferior energies work grossly and subtly, whereas the superior energy works as the central generating force. This is experienced in the human body. The gross elements, namely, earth, etc., form the external gross body and are like a coat, whereas the subtle mind and false ego act like the inner clothing of the body.
The movements of the body are first generated from the heart, and all the activities of the body are made possible by the senses, powered by the ten kinds of air within the body. The ten kinds of air are described as follows: The main air passing through the nose in breathing is called  prāṇa . The air which passes through the rectum as evacuated bodily air is called  apāna . The air which adjusts the foodstuff within the stomach and which sometimes sounds as belching is called  samāna . The air which passes through the throat and the stoppage of which constitutes suffocation is called the  udāna  air. And the total air which circulates throughout the entire body is called the  vyāna  air. Subtler than these five airs, there are others also. That which facilitates the opening of the eyes, mouth, etc., is called  nāga  air. The air which increases appetite is called  kṛkara  air. The air which helps contraction is called  kūrma  air. The air which helps relaxation by opening the mouth wide (in yawning) is called  devadatta  air, and the air which helps sustenance is called  dhanañjaya  air.
All these airs are generated from the center of the heart, which is one only. This central energy is superior energy of the Lord, who is seated within the heart with the soul of the body, who acts under the guidance of the Lord. This is explained in  Bhagavad-gītā  as follows:
sarvasya cāham hṛdi sanniviṣṭo 
    mattaḥ smṛtir jñānam apohanam ca 
    vedaiś ca sarvair aham eva vedyo 
    vedānta-kṛd veda-vid eva cāham 
 (Bg. 15.15)
The complete central force is generated from the heart by the Lord, who is seated there and who helps the conditioned soul in remembering and forgetting. The conditioned state is due to the soul's forgetfulness of his relationship of subordination to the Lord. One who wants to continue to forget the Lord is helped by the Lord to forget Him birth after birth, but one who remembers Him, by dint of association with a devotee of the Lord, is helped to remember Him more and more. Thus the conditioned soul can ultimately go back home, back to Godhead.
This process of transcendental help by the Lord is described in  Bhagavad-gītā  (10.10) as follows: