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The concept of 'measurement' becomes so fuzzy on reflection that it is quite surprising to have it appearing in physical theory at the most fundamental level... does not any analysis of measurement require concepts more fundamental than measurement? And should not the fundamental theory be about these more fundamental concepts?

— John Stewart Bell Quantum Mechanics for Cosmologists (1981)

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More quotes by John Stewart Bell

Theoretical physicists live in a classical world, looking out into a quantum-mechanical world. The latter we describe only subjectively, in terms of procedures and results in our classical domain.

Introduction to the hidden-variable question (1971)

On this list of bad words from good books, the worst of all is 'measurement'.

Against 'measurement (1990)

I am a Quantum Engineer, but on Sundays I Have Principles.

Information? Whose information? Information about what?

Einstein said that it is theory which decides what is 'observable'.

Against 'measurement (1990)

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Quote text and notes from Wikiquote: John Stewart Bell (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.