"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science, whatever the matter may be."
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Original Language: English
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William Thomson (Lord Kelvin), Lecture on "Electrical Units of Measurement" (3 May 1883), published in Lectures Vol. I, p. 73 (1889).
https://en.wikiquote.org/wiki/Mathematics
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Mathematics
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