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Contents of the Gītā Summarized
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परंपरागत प्रक्रिया
Qualitatively, the small atomic fragmental part of the Supreme Spirit is one with the Supreme. He undergoes no changes like the body. Sometimes the soul is called the steady, or  kūṭastha . The body is subject to six kinds of transformations. It takes its birth in the womb of the mother's body, remains for some time, grows, produces some effects, gradually dwindles, and at last vanishes into oblivion. The soul, however, does not go through such changes. The soul is not born, but, because he takes on a material body, the body takes its birth. The soul does not take birth there, and the soul does not die. Anything which has birth also has death. And because the soul has no birth, he therefore has no past, present or future. He is eternal, ever-existing, and primeval—that is, there is no trace in history of his coming into being. Under the impression of the body, we seek the history of birth, etc., of the soul. The soul does not at any time become old, as the body does. The so-called old man, therefore, feels himself to be in the same spirit as in his childhood or youth. The changes of the body do not affect the soul. The soul does not deteriorate like a tree, nor anything material. The soul has no by-product either. The by-products of the body, namely children, are also different individual souls; and, owing to the body, they appear as children of a particular man. The body develops because of the soul's presence, but the soul has neither offshoots nor change. Therefore, the soul is free from the six changes of the body.
In the  Katha Upaniṣad  also we find a similar passage which reads:
na jāyate mriyate vā vipaścin  
 nāyaṁ kutaścin na vibhūva kaścit  
 ajo nityaḥ śāśvato ’yaṁ purāṇo  
 na hanyate hanyamāne śarīre.
((Katha 1.2.18))
The meaning and purport of this verse is the same as in the  Bhagavad-gītā , but here in this verse there is one special word,  vipaścit , which means learned or with knowledge.
The soul is full of knowledge, or full always with consciousness. Therefore, consciousness is the symptom of the soul. Even if one does not find the soul within the heart, where he is situated, one can still understand the presence of the soul simply by the presence of consciousness. Sometimes we do not find the sun in the sky owing to clouds, or for some other reason, but the light of the sun is always there, and we are convinced that it is therefore daytime. As soon as there is a little light in the sky early in