“Time is that which is measured by a clock. This is a sound way of looking at things. A quantity like time, or any other physical measurement, does not exist in a completely abstract way. We find no sense in talking about something unless we specify how we measure it. It is the definition by the method of measuring a quantity that is the one sure way of avoiding talking nonsense about this kind of thing.”

—  Hermann Bondi

Hermann Bondi (1980), Relativity and Common Sense: A New Approach to Einstein, p. 65

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Hermann Bondi5
British mathematician and cosmologist 1919–2005

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