These rascals, they do not know. They simply think... Because nitya, nitya means ever-existing. So in the fire the living entities does not die. They sterilize. "Now it is sterilized." That is all nonsense. Sterilized means the body is killed, but not this... There is abortion. The body is killed. Contraception... The body is killed. But the soul, he's not killed. If you make some inconvenience to the soul, who has taken shelter in the womb, and you kill the body, then he'll have to search out another body. This is going on. Just see how the rascal civilization is going on. They're thinking they're killing. This way killed, that way killed. No. You, it is sinful because you create inconvenience to that particular soul. He was taking shelter, karmana daiva-netrena jantur dehopapattaye [SB 3.31.1]. By his karma he was given shelter to develop a body, and if you kill that body, that means you go against the order of the Supreme.
Lecture on Bhagavad-gita 2.12, London 18 August, 1973