The point is that Kṛṣṇa wanted to teach Arjuna that this body is different from the person. Just like every one of us, we are different from the shirt and coat. Similarly, we living entities, soul, is different from the gross body and the subtle body. This is the philosophy of Bhagavad-gītā. People do not understand it. Generally, people understand that he is this body. That is condemned in the śāstras.
- yasyātma-buddhiḥ kuṇape tri-dhātuke
- sva-dhīḥ kalatrādiṣu bhauma ijya-dhīḥ
- yat-tīrtha-buddhiḥ salile na karhicij
- janeṣv abhijñeṣu sa eva go-kharaḥ
- (SB 10.84.13)
Go means cow, and khara means ass. Anyone who is living on the bodily concept of life, yasyātma-buddhiḥ kuṇape tri-dhātuke... The bodily concept of life is meant for the animals. The dog does not know that he's not this body, he's pure soul. But a man, if he's educated, he can understand that he's not this body, he is different from this body.