Student (4): When some new animal or person is born, is the soul always a reincarnation of some previous soul, or can it be that a new soul has...
Prabhupāda: No. The same soul is changing, just like you are changing your dress. Now you are in some colored dress. You may have some white dress or some red dress. Similarly, vāsāṁsi jīrṇāni yathā vihāya (BG 2.22). As soon as your dress is old enough, you cannot use it any more, you have to change the dress. Similarly, the present body, as soon as it is no more workable, you have to accept another body. Now, taking it accepted as dress, that the next body means next dress, so that dress will be offered according to the payment, or according to your work. If you have worked just like a god, then you get the dress of a god, and if you have worked like a dog, then you'll get the dress of a dog.
Student (4): Then how can the dog then become a higher soul, a higher form after the dog?
Prabhupāda: Yes, there is gradual evolution. From dog life, from animal life, again by evolutionary process... That is accepted by anthropo... What is called? Anthropology. That they come to the human being, again there is a chance to get out of this bodily embodiment, and you can get yourself free life in the spiritual world. So if you lose this chance, then you again go to the cycle of birth and death in so many forms of bodies. Therefore we should utilize this enlightened body, the human form of body, the civilized form of life, for our next eternal life. Yad gatvā na nivartante tad dhāma paramaṁ mama (BG 15.6). We should prepare ourself to go to that form of life which has no more birth, death, or disease or old age. Eternal life. Yes.