“You use your brain much as you would use a radio crystal; you tune in different frequencies.”
Be Who You Want, Have What You Want: Change Your Thinking, Change Your Life
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Source: Crisis Management: A Model For Managers (1993), p. 76
Context: Two a. m. in a dark alley or on a mountainside is not the time to discover your unit is missing a key piece of equipment, or that you are not sure of the radio frequencies of an adjacent unit. The procedural check lists created in training will prevent those critical and unacceptable mistakes. This is the time to benefit from those "lessons learned". But leaders must schedule the time to train, do it right, critique, and move on. It is an investment that will bring the most return.

Advice to his art students; quoted in Lloyd Goodrich, Thomas Eakins (1933).

[No formula to it: Rohit Sharma, https://www.thehindu.com/sport/cricket/no-formula-to-it-rohit-sharma/article21615720.ece, The Hindu, 13 December 2017]

Source: Défense des Lettres [In Defense of Letters] (1937), p. 42