“When you aren’t willing to pay the price of learning by changing you will eventually pay the price of losing.”
Book Sometimes you win Sometimes you Learn
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John C. Maxwell 145
American author, speaker and pastor 1947Related quotes
“I like a man willing to pay the price of his pleasures”
Devoted

“Victory is reserved for those who are willing to pay its price.”
Attributed to Sun Tzu in multiple books and internet sites, but this text does not appear in The Art of War and seems to be a more recent creation.
Disputed

“But surely for everything you love you have to pay some price.”
Source: An Autobiography

“We must be prepared to pay the price for peace, or assuredly we shall pay the price of war.”
Special Message to the Congress on the Threat to the Freedom of Europe (1948)
Context: The recommendations I have made represent the most urgent steps toward securing the peace and preventing war. We must be ready to take every wise and necessary step to carry out this great purpose. This will require assistance to other nations. It will require an adequate and balanced military strength. We must be prepared to pay the price for peace, or assuredly we shall pay the price of war. We in the United States remain determined to seek peace by every possible means, a just and honorable basis for the settlement of international issues.

Des Moines Iowa speech (1 February 1916) http://www.combat.ws/S3/BAKISSUE/CMBT01N2/SMOKE.HTM, on "The Westerm Preparedness Tour" http://www.allthingswilliam.com/presidents/wilson.html
1910s