(Click to enlarge painting of Krishna's rasa dance)
"This body is a machine. And it is being worked by the nature. And direction is coming from the Supreme Lord. We wanted to enjoy a certain way, and Kṛṣṇa has given us a certain type of body, yantra. Just like you have got different makes of motorcar. You want... Somebody wants..., I want Buick car. Somebody says, 'I want Chevrolet,' some, 'Ford.' They are ready. Similarly, our body is also like that. Somebody is Ford, somebody is Chevrolet, somebody is Buick, and Kṛṣṇa has given us the chance, 'You wanted this kind of car, or body. You sit down and enjoy.' This is our material position.
Īśvaraḥ sarva-bhūtānāṁ hṛd-deśe arjuna tiṣṭhati (BG 18.61). We forget. After changing the body, we forget what I desired and why I have got this kind of body. But Kṛṣṇa, He is situated within your heart. He does not forget. He gives you. Ye yathā māṁ prapadyante (BG 4.11). You wanted this kind of body: you get it. Kṛṣṇa is so kind. If somebody wanted a body so that he can eat everything, so Kṛṣṇa gives him the body of a pig, so it can eat even stool. And if somebody wanted a body that 'I shall dance with Kṛṣṇa,' then he gets that body. Now, it is up to you to decide whether you are going to get a body which will be able to dance with Kṛṣṇa, to talk with Kṛṣṇa, to play with Kṛṣṇa. You can get it. And if you want a body how to eat stool, urine, you will get it.
So we have to decide, this human form of life. But if you have no information that 'What kind of body I am going to get next,' if you don't believe... You believe or not believe, it doesn't matter; the nature's law will act. If you say, 'I don't believe in the next life,' you may say like that, but nature's law will act. Karmaṇā daiva-netreṇa (SB 3.31.1). As you are acting, according to that, you are preparing your next body. So after death—after death means when this body is finished— then you get another body immediately, because you have already made the fieldwork, what kind of body you will get."
(Srila Prabhupada Lecture, Philadelphia, July 12, 1975)