I'd say the most memorable ...
More phrases
Effort only fully releases its reward after a person refuses to quit.
Never complain and never explain.
A good plan violently executed now is better than a perfect plan executed next week.
George S. Patton
Problems are not stop signs, they are guidelines.
Robert Schuller
Never give up, for that is just the place and time that the tide will turn.
Harriet Beecher Stowe
Quotes from the same author
I believe more in precision, when you have the capability, like when you see a mosquito fly and you're able to hit it, you're able to hit it with a couple of short sharp shots... it's a beautiful thing.
Alexis Arguello
When you won that title you should know now that you are representing a whole country or nation with your actions and you are now in a glass house or under a microscope and you better be ready to make your people proud.
Alexis Arguello