Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)
Context: It is easy to measure your mastery of the results via a conventional examination; it is less easy to measure your mastery of doing mathematics, of creating new (to you) results, and of your ability to surmount the almost infinite details to see the general situation.
“It is not easy to measure the ocean, but we can be measured by it, confront it, and be in it.”
Source: The Archaic Revival
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Terence McKenna 111
American ethnobotanist 1946–2000Related quotes

in his memoirs, as quoted by [Jean Matricon, G. Waysand, Charles Glashausser, The cold wars: a history of superconductivity, Rutgers University Press, 2003, 0813532957, 18]
Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)

“The scale we measure things by is the measure of our own mind.”
Der Maßstab, den wir an die Dinge legen, ist das Maß unseres eigenen Geistes.
Source: Aphorisms (1880/1893), p. 52.

"Matteo" in Concerning the New Star (1606)
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“Managers who don't know how to measure what they want settle for wanting what they can measure.”
For example, those who want a high quality of work life but don't know how to measure it, often settle for wanting a high standard of living because they can measure it.
Source: 2000s, A little book of f-laws: 13 common sins of management, 2006, p. 4, bold text cited in: Colin J. Neill, Phillip A. Laplante, Joanna F. DeFranco (2011) Antipatterns: Managing Software Organizations and People.