“The first principle is that you must not fool yourself—and you are the easiest person to fool. So you have to be very careful about that. After you’ve not fooled yourself, it’s easy not to fool other scientists. You just have to be honest in a conventional way after that.”
― Surely You're Joking, Mr. Feynman! Adventures of a Curious Character
― Surely You're Joking, Mr. Feynman! Adventures of a Curious Character
“That was a very good way to get educated, working on the senior problems and learning how to pronounce things.”
― Surely You're Joking, Mr. Feynman!: Adventures of a Curious Character
― Surely You're Joking, Mr. Feynman!: Adventures of a Curious Character
“innovation is a very difficult thing in the real world”
― Surely You're Joking, Mr. Feynman!: Adventures of a Curious Character
― Surely You're Joking, Mr. Feynman!: Adventures of a Curious Character
“476. Children do not learn that books exist, that armchairs exist, etc.,etc. - they learn to fetch books, sit in armchairs, etc.,etc.
Later, questions about the existence of things do of course arise, "Is there such a thing as a unicorn?" and so on. But such a question is possible only because as a rule no corresponding question presents itself. For how does one know how to set about satisfying oneself of the existence of unicorns? How did one learn the method for determining whether something exists or not?
477. "So one must know that the objects whose names one teaches a child by an ostensive definition exist." - Why must one know they do? Isn't it enough that experience doesn't later show the opposite?
For why should the language-game rest on some kind of knowledge?
478. Does a child believe that milk exists? Or does it know that milk exists? Does a cat know that a mouse exists?
479. Are we to say that the knowledge that there are physical objects comes very early or very late?”
― On Certainty
Later, questions about the existence of things do of course arise, "Is there such a thing as a unicorn?" and so on. But such a question is possible only because as a rule no corresponding question presents itself. For how does one know how to set about satisfying oneself of the existence of unicorns? How did one learn the method for determining whether something exists or not?
477. "So one must know that the objects whose names one teaches a child by an ostensive definition exist." - Why must one know they do? Isn't it enough that experience doesn't later show the opposite?
For why should the language-game rest on some kind of knowledge?
478. Does a child believe that milk exists? Or does it know that milk exists? Does a cat know that a mouse exists?
479. Are we to say that the knowledge that there are physical objects comes very early or very late?”
― On Certainty
“I wouldn’t stop until I figured the damn thing out–it would take me fifteen or twenty minutes. But during the day, other guys would come to me with the same problem, and I’d do it for them in a flash. So for one guy, to do it took me twenty minutes, while there were five guys who thought I was a super-genius.”
― Surely You're Joking, Mr. Feynman!: Adventures of a Curious Character
― Surely You're Joking, Mr. Feynman!: Adventures of a Curious Character
Sophia’s 2025 Year in Books
Take a look at Sophia’s Year in Books, including some fun facts about their reading.
Favorite Genres
Biography, Classics, History, Memoir, Non-fiction, Philosophy, Poetry, Religion, Science, Science fiction, Travel, Hobbies, Economics, German, and Auschwitz
Polls voted on by Sophia
Lists liked by Sophia




