Were I to use the wits the good Spirits gave me," he said, "then I would say this lady cannot exist — for what sane man would hold a dream to be real… - Isaac Asimov

I first worked out the final form of the Three Laws, and used them explicitly, in my fourth robot story, "Runaround," which appeared in the March 1942 issue of Astounding. The Three Laws first appear on page 100 of that issue. I looked that up, because where they appear there is the very first use of the word "robotics" in the history of the world, as far as I know.

it may be worth listening to all that scraping, tootling, and banging, for whatever information it might conceivably yield concerning Earth.

Above all, never think you're not good enough. Never think that. In life people will take you at your own reckoning.