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Could you please put in layman terms what this means for me since I am more like Jung when it comes to mathes than Einstein.
My own math might be just a little bit Jungian

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Partly, I think there is a professional tension among physicists between the experimentalists and the theorists. Einstein was a theorist, so no surprise that he thinks that's a good way to do physics

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Beyond that, I would guess that Einstein might be referring to how he built up his theories of relativity, a lot like Euclid in geometry, by deductions starting from "small" postulates. There is no preferred direction in space, for instance, or that the laws of physics are the same for all observers. (Don't look too carefully at that constant speed of light in a vacuum

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I think part of what Einstein is saying is that he is discovering correct physics by carefully working out the implications of intuitively appealing postulates - pure deductive thought. And those postulates are (mostly) not based on experience, but on a sense that there should be universal laws and so on.
I wonder if Einstein would have said the same thing 20 years later. We know the story of black holes. His original equations predicted them. He looked at that, and intuition untutored by experience made him think WTF? and he decided there shouldn't be black holes, so he put in a fudge factor, and black holes were gone.
Then some other people got to thinking about those black holes, and still without much in the way of experience, their intuition told them that maybe there were black holes after all. And, if the story is true, there was a meeting, and Einstein was convinced to lose the fudge factor.
We've had threads here that having direct experience of black holes is more than a little difficult. But there are some observable phenomena in the vicinity of black holes that would be "signature" events, and some of those events have been observed.
So was it intuition-with-pure-thought or experience that led to the establishment of the reality of black holes?
I think both. But "pure thought" added a great deal to the raw material of experience. That's no small thing.
Anyway, that's what I think Einstein was talking about, maybe putting it a little strongly in 1933, but not so far off the mark as to require retraction later on.