“Never engross the whole conversation to yourself. Say as little of yourself and friends as possible.”

As quoted in The Enlightened Mind (1991), edited by Stephen Mitchell
Context: Little by little, wean yourself. This is the gist of what I have to say. From an embryo, whose nourishment comes in the blood, move to an infant drinking milk, to a child on solid food, to a searcher after wisdom, to a hunter of more invisible game.
Think how it is to have a conversation with an embryo. You might say, "The world outside is vast and intricate. There are wheatfields and mountain passes, and orchards in bloom. At night there are millions of galaxies, and in sunlight the beauty of friends dancing at a wedding."
You ask the embryo why he, or she, stays cooped up in the dark with eyes closed. Listen to the answer.
There is no "other world." I only know what I've experienced. You must be hallucinating.

because you will get "down the drain", into a blind alley from which nobody has yet escaped. Nobody knows how it can be like that.
Concerning the apparent absurdities of quantum behavior.
Source: The Character of Physical Law (1965), chapter 6, “Probability and Uncertainty — the Quantum Mechanical View of Nature,” p. 129

Sketchbook 1966-1977

A Conversation with Ward Cunningham (2003), The Simplest Thing that Could Possibly Work
Context: You are always taught to do as much as you can. Always put checks in. Always look for exceptions. Always handle the most general case. Always give the user the best advice. Always print a meaningful error message. Always this. Always that. You have so many things in the background that you're supposed to do, there's no room left to think. I say, forget all that and ask yourself, "What's the simplest thing that could possibly work?"
I think the advice got turned into a command: "Do the simplest thing that could possibly work." That's a little more confusing, because there isn't this notion that as soon as you've done it, we'll evaluate it.

Jack Hay was based on Ron Brewer, who had been Potter's agent when he was Labour candidate for East Hertfordshire in the 1964 general election.
Vote, vote, vote for Nigel Barton (1965)