“Fatigue makes cowards of all of us.”
War as I knew it (1947), as cited in Oxford Dictionary of American Quotations, By Hugh Rawson, Margaret Miner, p. 258 https://books.google.com/books?id=whg05Z4Nwo0C&pg=PA258(via books.google.com).
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George S. Patton 77
United States Army general 1885–1945Related quotes

“The Nonconformist Conscience makes cowards of us all.”
"A Note on George the Fourth," http://books.google.com/books?id=NA0HAQAAIAAJ&q=%22The+NonConformist+Conscience+makes+cowards+of+us+all%22&pg=PA250#v=onepage The Yellow Book (October 1894)
"King George the Fourth," http://books.google.com/books?id=OvlGAAAAYAAJ&q=%22The+Nonconformist+Conscience+makes+cowards+of+us+all%22&pg=PA63#v=onepage The Works of Max Beerbohm (1896)
“The fear of being laughed at makes cowards of us all.”
The Complete Neurotic's Notebook (1981), Unclassified

“Because when everyone dreams, but only a few realize their dreams, that makes cowards of us all.”
Source: Veronika Decides to Die

“It's fear that makes us lose our conscience. It's also what transforms us into cowards.”
Source: The Complete Persepolis
Source: The Wheel of Time: Shamans of Ancient Mexico, Their Thoughts About Life, Death and the Universe], (1998), Quotations from The Teachings of Don Juan (Chapter 4)

If you start an argument with yourself, that makes two people at least, and when you have two people, one of them starts appeasing the other.
"Epistle from Mother Carey's Chicken"
Peter quotes 'Conscience doth make cowards of us all' from the 'To be, or not to be' speech in Shakespeare's Hamlet, Act 3, scene 1.
Birds of America (1971)
Source: The Gate to Women's Country (1988), Chapter 34 (p. 302)

“To sin by silence when they should protest makes cowards of men.”
Sometimes attributed to Lincoln since a 1950 speech of Douglas MacArthur citing him as its author, this is actually from a poem by Ella Wheeler Wilcox.
Misattributed
Source: The Teachings of Don Juan: A Yaqui Way of Knowledge