For an athlete to function properly, he must be intent. There has to be a definite purpose and goal if you are to progress. If you are not intent about what you are doing, you aren't able to resist the temptation to do something else that might be more fun at the moment.
For an athlete to function ...
Quotes from the same author
Whatever you do in life, surround yourself with smart people who'll argue with you.
You can't let praise or criticism get to you. It's a weakness to get caught up in either one.
Never mistake activity for achievement.
Talent is God given. Be humble. Fame is man-given. Be grateful. Conceit is self-given. Be careful.
Be true to yourself, help others, make each day your masterpiece, make friendship a fine art, drink deeply from good books - especially the Bible, build a shelter against a rainy day, give thanks for your blessings and pray for guidance every day.