Source: Your Forces and How to Use Them (1912), Chapter 14, p. 210
“In and of itself, the market is not, and must not become, the place where the strong subdue the weak.”
2009, Cartias in Vertitate (29 June 2009)
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Pope Benedict XVI 117
265th Pope of the Catholic Church 1927Related quotes
Source: The Theory of Gambling and Statistical Logic (Revised Edition) 1977, Chapter Nine, Weighted Statistical Logic And Statistical Games, p. 299

“Labour itself is but a sorrowful song,
The protest of the weak against the strong.”
The Sorrowful World.
Bartlett's Familiar Quotations, 10th ed. (1919)

“The strong need the weak in order to become more human, more compassionate.”
Jean Vanier: Philosopher.. http://www.independent.co.uk/news/people/jean-vanier-philosopher-who-dislikes-the-religion-of-success-wins-12m-templeton-prize-for-promoting-spiritual-awareness-10101621.html The Independent, 11 March 2015
From interviews and talks

“Build up your weaknesses until they become your strong points.”
As quoted in Knute Rockne: Man Builder (1940) by Harry Augustus Stuhldreher, p. 53
"Living the Mandate", p. 40
The last part of the quote, about those who trade their souls to the 'in between', alludes to Rev 3:15-16.
Unfinished Pilgrimage (1995)