STOP AND THINK – What we achieve inwardly will change outer reality. (Plutarch, 1st & 2nd century Greek historian and essayist)
Experience should teach us that what we are internally (mind and heart) ultimately determines how we behave outwardly. What we do in reality demonstrates what we really are. So, in addition to improving our physical skills—which, of course, we should try to do—we must work on the inner self, improving our mind, intellect, and character.
Do not conform to the pattern of this world, but be transformed by the renewing of your mind. (Romans 12:2)