Quotation
Last reviewed:
“What I cannot create, I do not understand.”
Richard Feynman · Thinkers beyond philosophy · Modern · 1988
What does it mean?
Understanding, on this note, is tied to being able to build the thing, not only to recognise the name or the formula. The usual reading takes it as a personal standard: if he could not make it, he did not yet understand it. A competing reading turns it into a rule that nothing is real unless you can manufacture it in a shed, which a note on a blackboard does not legislate. The sentence was photographed in his Caltech office in 1988. It belongs with the father's lesson about names. Creation here is the physicist's test of grasp. It is not a slogan for entrepreneurship.
Did Richard Feynman really say this?
The library’s label is Well attested. His writing on the office blackboard, documented in photographs after he died. It is not a sentence from a paper or from The Character of Physical Law. Treat it as a note he left, not as a theorem with a chapter.
Where it comes from
Note on the blackboard in his Caltech office, photographed after his death in February 1988
Approximate date: 1988.
How to use it
Before you say you understand a mechanism, in a kitchen in York or a lab, try to produce it from the start without the page in front of you. If you cannot, the note says you are not done. It does not say the mechanism is false.
A mindset reading
A note is allowed to be strict with its author. Using it to shame a learner on day one is harsher than the blackboard was. He was talking to himself.
Understand the philosophy
The source is a blackboard, February 1988, not a chapter. The key verb is create, in the sense of construct the account or the result. The name-and-thing sentence in the 1988 book is the childhood form of the same standard. Chapter 7 of the 1965 lectures is how a created guess still has to meet experiment.
- knowledge
- mind
FAQ
What does it mean?
Understanding, on this note, is tied to being able to build the thing, not only to recognise the name or the formula. The usual reading takes it as a personal standard: if he could not make it, he did not yet understand it. A competing reading turns it into a rule that nothing is real unless you can manufacture it in a shed, which a note on a blackboard does not legislate. The sentence was photographed in his Caltech office in 1988. It belongs with the father's lesson about names. Creation here is the physicist's test of grasp. It is not a slogan for entrepreneurship.
Did Richard Feynman really say this?
Well attested. His writing on the office blackboard, documented in photographs after he died. It is not a sentence from a paper or from The Character of Physical Law. Treat it as a note he left, not as a theorem with a chapter.
Which work is it in?
Note on the blackboard in his Caltech office, photographed after his death in February 1988 Approximate date: 1988.