You can only get smarter by playing a smarter opponent.

From the movie "Revolver": tips for gambling, but I guess it applies for lives as well:

1. You can only get smarter by playing a smarter opponent.
   
2. The greatest enemy will hide in the last place you would ever look.
   
3. The harder the battle, the sweeter the victory.
   
4. Always protect your investment whether it's in your interest or not.