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Rāja-vidyā: The King of Knowledge
and in the verse quoted above, His omnipotence is explained. Kṛṣṇa has no birth, and He is eternal. Similarly, the living entity has no birth, and he is also eternal. It is only the body with which the living entity identifies that takes birth.
In the very beginning of  Bhagavad-gītā , in the Second Chapter, Kṛṣṇa explains that what we accept as birth and death is due to the body, and as soon as we regain our spiritual body and get out of the contamination of birth and death, we should be qualitatively as good as Kṛṣṇa. That is the whole process of Kṛṣṇa consciousness—the revival of our original  saccid-ānanda  spiritual body. That body is eternal ( sat ), full of knowledge ( cit ), and blissful ( ānanda ). This material body is neither  sat ,  cit , nor  ānanda . It is perishable, whereas the person who is occupying the body is imperishable. It is also full of ignorance, and because it is ignorant and temporary, it is full of misery. We feel severe hot or severe cold due to the material body, but as soon as we revive our spiritual body, we become unaffected by dualities. Even while within the material bodies there are  yogīs  who are impervious to dualities such as heat and cold. As we begin to make spiritual advancement while in the material body, we begin to take on the qualities of a spiritual body. If we put iron into a fire, it becomes hot, and then it becomes red-hot, and finally it is no longer iron, but fire—whatever it touches bursts into flames. As we become advanced in Kṛṣṇa consciousness, our material body will become spiritualized and will no longer be affected by material contamination.