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.

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Source: 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 ISBN 0521371406

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This source-reviewed Einstein quotation develops a complete idea around whether, observe, thing. The wording "Whether you can observe a thing or not depends on…" is tied to Objecting to the placing of observables at the heart of the new quantum mechanics, during…, so readers can connect its themes of science and wisdom to a documented context rather than a detached slogan.

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