So go to God, or Kṛṣṇa, means you'll have to acquire your original, spiritual body. The spiritual body is already there, but we are now covered by this material body. So how we are eternal, that is described in the Bhagavad-gītā:
- avināśi tu tad viddhi
- yena sarvam idaṁ tatam
- vināśam avyayasyāsya
- na kaścit kartum arhati
The hint is given: the something which is spread all over the body, that is eternal. And what is that something? That something is our consciousness. Here it is stated, avināśi tu tad viddhi yena sarvam idaṁ tatam. In this body there is something. That is consciousness. That is eternal. Just like if you or I pinch my body, I feel pain because the consciousness is there. But when the consciousness will not be there, if I cut my hand or cut your hand, you'll not protest. Even scientists have proved this consciousness is there in the tree also. If you cut the tree, there is sensation, feeling some pain, and this is recorded in the machine. So here it is hinted that this consciousness is spread all over the body, that is eternal. The body is not eternal. As soon as the consciousness is gone, the body is dead. Therefore we should take care of the thing which is cons... That is the soul. On account of presence of the soul, there is consciousness.