That is accepted in Darwin's theory also, anthropomorphism. What is that? Anthropology, yes. Not anthropomorphism. Anthropology. Anthropology, there is evolutionary process. So that is accepted in the Vedic literature also.
So the animal which is sacrificed, he gets immediately his evolutionary process developed and promoted from animal life to human life. But the man who is offering that sacrifice, he becomes responsible. These are therefore so many hymns in the Vedic literature. So whole idea is that by offering such sacrifices man is restricted from flesh-eating.
Similarly, there are many kinds of sacrifices they are described here. I think those descriptions may not be very elaborately described, but I will give you the idea.
- daivam evāpare yajñaṁ
- yoginaḥ paryupāsate
- brahmāgnāv apare yajñaṁ
- yajñenaivopajuhvati
- śrotrādīnīndriyāṇy anye
- saṁyamāgniṣu juhvati
- śabdādīn viṣayān anya
- indriyāgniṣu juhvati
Yajña-dāna-tapaḥ-karma. Yajña-dāna-tapaḥ-karma na tyājyaṁ kāryam eva tat. This is stated in the Bhagavad-gītā that yajña, sacrifice, charity, dāna. Yajña, dāna and tapaḥ, tapaḥ. Tapaḥ means penance.
Now, there are four divisions of human society according to Vedic literature: the brahmacārī, the gṛhastha, the vānaprastha and the sannyāsa. The brahmacārī means the student life, more or less, student life. And gṛhastha means those who are leading family life, after the student life. And vānaprastha means retired life. And the sannyāsa means renounced order. They have no connection with worldly activities. So these are four different stages of human social order. Now, the brahmacārī, they are meant for sacrifice, the students. The students are recommended to sacrifice, especially to sacrifice sense gratification.