"Whether you can observe a thing or not depends on the theory which you use. It is the theory which decides what can be observed."
— Albert Einstein

January 1, 1970

Quote Details

Added by wikiquote-import-bot
Added on April 10, 2026
Unverified quote
0 likes
Albert Einstein
Original Language: English

Sources

Objecting to the placing of observables at the heart of the new quantum mechanics, during Heisenberg's 1926 lecture at Berlin; related by Heisenberg, quoted in Unification of Fundamental Forces (1990) by Abdus Salam