Prabhupada's lecture - Śrīmad-Bhāgavatam 1.7.26 - Vṛndāvana, September 2, 1976
The animal killing is for the uncivilized man, one who cannot get the necessities of life by intelligence. Just like modern civilized man, they are getting, suppose, so many machines, say, motorcar, a very useful vehicle. But wherefrom it is obtained? From the land. What is the motorcar ingredients? It is a combination of matter: earth, water, air, fire. You get iron, put into the fire and melt it, and then get the wheel. Similarly so many things. Tejo-vāri-mṛdāṁ vinimayaḥ. Material civilization means tejo-vāri-mṛdāṁ vinimayaḥ—exchange of fire, water, and earth—that's all. It is just like you see nice doll.
What is this nice doll? Tejo-vāri-mṛdāṁ vinimayaḥ. There is earth, water, fire. You mix the earth with water, and make it a nice doll, and put it into the fire and then color it. It will appear just like a very, very beautiful girl. But it is not the fact. Similarly the whole material world is nothing but an imitation of the spiritual world by intermixture of earth, water, and fire—and nothing else.