na kascit--no one; kartum--to do; arhati--is able.

                             

TRANSLATION

   Know that which pervades the entire body is indestructible. No one is 

able to destroy the imperishable soul.

                               

PURPORT

   This verse more clearly explains the real nature of the soul, which is 

spread all over the body. Anyone can understand what is spread all over the

 body: it is consciousness. Everyone is conscious of the pains and 

pleasures of the body in part or as a whole. This spreading of 

consciousness is limited within one's own body. The pains and pleasures of 

one body are unknown to another. Therefore, each and every body is the 

embodiment of an individual soul, and the symptom of the soul's presence 

is perceived as individual consciousness. This soul is described as one 

ten-thousandth part of the upper portion of the hair point in size. The 

Svetasvatara Upanisad (5.9) confirms this:

    balagra-sata-bhagasya
   satadha kalpitasya ca
   bhago jivah vijneyah
   sa canantyaya kalpate

   "When the upper point of a hair is divided into one hundred parts and 

again each of such parts is further divided into one hundred parts, each such part is the measurement of the dimension of the spirit soul." Similarly the same version is stated:

                       

 kesagra-sata-bhagasya
                            satamsah sadrsatma                  

    jivah suksma-svarupo 'yam 

    sankhyatito hi cit-kanah

        
                        

   "There are innumerable particles of spiritual atoms, which are measured 

as one ten-thousandth of the upper portion of the hair."
   Therefore, the individual particle of spirit soul is a spiritual atom 

smaller than the material atoms, and such atoms are innumerable. This very 

small spiritual spark is the basic principle of the material body, and the influence of such a spiritual spark is spread all over the body as the influence of the active principle of some medicine spreads throughout the body. This current of the spirit soul is felt all over the body as consciousness, and that is the proof of the presence of the soul. Any layman can understand that the material body minus consciousness is a dead body, and this consciousness cannot be revived in the body by any means of material administration. Therefore, consciousness is not due to any amount of material combination, but to the spirit soul. In the Mundaka Upanisad (3.1.9) the measurement of the atomic spirit soul is further explained:

    eso 'nur atma cetasa veditavyo
        yasmin pranah pancadha samvivesa
      pranais cittam sarvam otam prajanam
          yasmin visuddhe vibhavaty esa atma

   "The soul is atomic in size and can be perceived by perfect intelligence.

 This atomic soul is floating in the five kinds of air [prana, apana, vyana,

 samana and udana], is situated within the heart, and spreads its influence 

all over the body of the embodied living entities. When the soul is 

purified from the contamination of the five kinds of material air, its 

spiritual influence is exhibited."
   The hatha-yoga system is meant for controlling the five kinds of air 

encircling the pure soul by different kinds of sitting postures--not for 

any material profit, but for liberation of the minute soul from the 

entanglement of the material atmosphere.
   So the constitution of the atomic soul is admitted in all Vedic 

literatures, and it is also actually felt in the practical experience of 

any sane man. Only the insane man can think of this atomic soul as 

all-pervading visnu-tattva.
   The influence of the atomic soul can be spread all over a particular 

body. According to the Mundaka Upanisad, this atomic soul is situated in 

the heart of every living entity, and because the measurement of the atomic

 soul is beyond the power of appreciation of the material scientists, some 

of them assert foolishly that there is no soul. The individual atomic soul

 is definitely there in the heart along with the Supersoul, and thus all 

the energies of bodily movement are emanating from this part of the body. 

The corpuscles which carry the oxygen from the lungs gather energy from 

the soul. When the soul passes away from this position, activity of the 

blood, generating fusion, ceases. Medical science accepts the importance

 of the red corpuscles, but it cannot ascertain that the source of the 

energy is the soul. Medical science, however, does admit that the heart is 

the seat of all energies of the body.

   Such atomic particles of the spirit whole are compared to the sunshine 

molecules. In the sunshine there are innumerable radiant molecules. 

Similarly, the fragmental parts of the Supreme Lord are atomic sparks of 

the rays of the Supreme Lord, called by the name prabha, or superior energy.

 Neither Vedic knowledge nor modern science denies the existence of the 

spirit soul in the body, and the science of the soul is explicitly 

described in the Bhagavad-gita by the Personality of Godhead Himself.



   HDG A.C. Bhaktivedanta Swami Prabhupada