Based on the short story "Downwind from Gettysburg" by Ray Bradbury. The story was first published in Playboy (June 1969).

Walter Bayes: There are plenty of stories, John. Things that passion will force a man to do. Me at five in the morning, Gettysburg, listening to the dawn chorus, trying to capture the atmosphere. Or at Bull Run in the teeming rain. Wanting to feel what he must have felt about the waste of war. Or in jail, in Washington, trying to explain what I was doing crawling around the Lincoln Memorial with a tape measure.

Walter Bayes: The tomb was not your place. Arise. We must, oh, we must stand, all of us, downwind from Gettysburg. It is the only hearing place.

Walter Bayes: Isn't it fine? They will stand in the meadow fields of Gettysburg and listen, learn, see, hone the edge of their razor souls and live!

Walter Bayes: Subtext: you're a coward.
Norman Llewellyn Booth: No.
Walter Bayes: Yes.
Norman Llewellyn Booth: No, not a coward. Brave. Brave enough to know I had to do something about fear.
Walter Bayes: Fear of what?
Norman Llewellyn Booth: Things, people, places. Things I wanted to have but never took. People I wanted to boss around, never could. Places I wanted to go, never went. So I thought if you can't find something to be glad about, find ways to be sad. Find something awful to do and cry about it.

Norman Llewellyn Booth: I'm jealous. Jealous of anything that works, anything that lasts, anything that's perfect.
Walter Bayes: Machines?
Norman Llewellyn Booth: Damn right, machines. I could never be as perfect as that... that eternal President.

Changes from the short story:

* The story of the man and his son at Gettysburg is told by Bayes, not Phipps
* Phipps is the creator of the robot in the short story, which isn't made clear in the episode
* Phipps never appears in the short story except in flashback, although he is a critical part of the tale. In the episode, he appears throughout and functions as a sounding board for Bayes' exposition.