"Yes, Dr. Calvin. In reality. In my dream, however, it seemed to me there was neither First nor Second Law, but only the Third, and the Third law was
'A robot must protect its own existence.' That was the whole of the Law." (Asimov, 95)
“Your mother didn’t have to say to you, ‘Mustn’t eat your playmates, dear; that’s not nice,’ because you soaked it up from our whole culture─and so did I.” (Heinlein, 161)