Albert Einstein? Charles F. Kettering? Wernher von Braun? Luis de Florez? Charles Erwin Wilson? David C. Hazen?

Question for Quote Investigator: There are no guaranteed outcomes when research is conducted. The results might be valuable or worthless. The following saying reflects this uncertainty. Here are two versions:
(1) If we knew what it was we were doing, it wouldn’t be called research, would it?
(2) If we knew what it was we would learn, it just wouldn’t be research, would it?
This saying has been attributed to the famous physicist Albert Einstein, but I am skeptical because there are so many fake Einstein quotations. Would you please explore this topic?
Reply from Quote Investigator: QI has found no substantive evidence that Albert Einstein wrote or spoke this statement. It is not listed in the comprehensive reference “The Ultimate Quotable Einstein” from Princeton University Press.1
This notion can be expressed in many ways; hence, it is difficult to trace. Here is an evolutionary overview with dates and attributions:
1923: Research wouldn’t be research if we didn’t try everything but the right thing. The only time it’s disgraceful to fail on a research is the last time. (Charles F. Kettering, President of the General Motors Research Corporation)
1946: If I knew in advance what the results will be, the work wouldn’t be research. (Luis de Florez, Rear Admiral in the United States Navy)
1954: If you knew for sure you were going to get the answer you wanted to get it would not be research. You would have passed that stage. It would be in the engineering application stage. (Charles Erwin Wilson, U.S. Secretary of Defense)
1958: If everything you started was bound to be successful, it wouldn’t be research and it wouldn’t be development. It would be just straight engineering. (Charles Erwin Wilson, Former U.S. Secretary of Defense)
1959: We don’t know really for sure what is going to come out of these programs—they wouldn’t be research programs, of course if we knew ahead of time what we were going to do. (Harold W. Ritchey, Vice President, Rocket Divisions, Thiokol Chemical Corp.)
1965: If research and development didn’t have its failures as well as its successes, it wouldn’t be called research and development. (Remark in anonymous editorial in “Army” magazine)
1967: If we knew what it was we would learn, it just wouldn’t be research, would it? (Attributed to David C. Hazen, Professor of Aerospace Engineering at Princeton University)
1986: If we knew what we were doing, it wouldn’t be called research. (Anonymous epigraph in PhD thesis by John Stewart Denker)
1989: If we knew how it worked, it wouldn’t be called research. (No attribution given in a message posted to Usenet newsgroup comp.sys.mac)
1991: If we knew what we were doing, it wouldn’t be called research. (Attributed to Argonne ATLAS in a message posted to Usenet newsgroup comp.os.vms)
1992: If we knew what we were doing, it wouldn’t be called research. (Attributed to Wernher von Braun in a message posted to Usenet newsgroup rec.music.makers)
1994: If we knew what it was we were doing, it would not be called research, would it? (Attributed to Albert Einstein in a message posted to Usenet newsgroup alt.usage.english)
Below are details for selected citations in chronological order.
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