“Defeat exists but not suffering. A true warrior knows that when he loses a battle, he is improving the skill with which he wields a sword. He will be able to fight more skilfullly next time.”
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Paulo Coelho 844
Brazilian lyricist and novelist 1947Related quotes

(1835-3) (Vol.45) Deathbed of Alexander the Great
The Monthly Magazine
“A warrior acts as if he knows what he is doing, when in effect he knows nothing.”
Source: The Wheel of Time: Shamans of Ancient Mexico, Their Thoughts About Life, Death and the Universe], (1998), Quotations from "Journey to Ixtlan" (Chapter 8)

As quoted in Honor Your Gifts (2007) by Dona M. Deane, p. 199.
Variant: But there is suffering in life, and there are defeats. No one can avoid them. But it's better to lose some of the battles in the struggles for your dreams than to be defeated without ever knowing what you're fighting for

Floyd Mayweather Jr describing Hattons boxing ability after Hatton mentioned that his next fight could well be against him. http://news2.thdo.bbc.co.uk/sport1/hi/boxing/6235742.stm
Other boxers on Ricky(Sourced)

Source: Battlefield of the Mind: Winning the Battle in Your Mind

“He who knows when he can fight and when he cannot will be victorious.”
Source: The Art of War, Chapter III · Strategic Attack
“He who enlists a man's mind wields a power even greater than the sword or the scepter.”
Source: The Worldly Philosophers (1953), Chapter I, Introduction, p. 3