We are getting different types of bodies according to the association with the material nature. So if you don't associate with this material nature, then you don't get all these material bodies. So how you can get out of this material nature? That is stated in the Bhagavad-gītā, you will find:
- māṁ ca 'vyabhicāreṇa
- bhakti-yogena yaḥ sevate
- sa guṇān samatītyaitān
- brahma-bhūyāya kalpate
- (BG 14.26)
One who is constantly engaged in Kṛṣṇa's service, he is not associating with this material nature. He is associating directly with Kṛṣṇa, the supreme spirit.
So if you keep yourself constantly engaged in Kṛṣṇa consciousness, then you are not in this material world. There is no more fear of what kind of body you will get next. You will get next body go back to home, back to Godhead. This is wanted. If you go back to home, back to God, in the same style of body as Kṛṣṇa has got, spiritual body, īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda-vigrahaḥ (Bs. 5.1)—then no more birth. That is stated in the Bhagavad-gītā, that tyaktvā dehaṁ punar janma naiti mām eti kaunteya (BG 4.9). The devotees who are constantly thinking of Kṛṣṇa, trying to understand Kṛṣṇa and engaged in Kṛṣṇa's service, such personality, after giving up this body . . . we have to give up this body. Everyone, the cats, dogs, they will also give up body. We shall also give up body. But the difference is, a devotee after giving up this body, he does not get anymore material body.
So our request is, those who have come to Kṛṣṇa consciousness, don't fall down again in the material qualities. That will not help you. Remain strictly adherent to the spiritual activities, and your life will be successful.