“Pain was their body's way of telling them that they'd pushed themselves to their limits -- which was exactly where they were supposed to be.”
Source: Rogue Warrior
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Richard Marcinko 2
Navy SEAL, Author 1940Related quotes

Source: Redemption in Indigo (2010), Chapter 18 “A Spider in His Parlour and a Very Eager Fly” (p. 139)

“Pain is the body's way of ridding itself of weakness.”
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"Only the Soul"
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The Notebooks of Leonardo da Vinci (1883), II Linear Perspective
Source: The Charioteer (1953), p. 141
Context: After some years of muddled thinking on the subject, he suddenly saw quite clearly what it was he had been running away from; why he had refused Sandy's first invitation, an what the trouble had been with Charles. It was also the trouble, he perceived, with nine-tenths or the people here tonight. They were specialists. They had not merely accepted their limitations, as Laurie was ready to accept his, loyal to his humanity if not to his sex, and bringing an extra humility to the hard study of human experience. They had identified themselves with their limitations; they were making a career of them. They had turned from all other reality, and curled up in them snugly, as in a womb.
Source: Time Cat (1963), Chapter 3 “Neter-Khet” (p. 20)