What happens to a big talker when a great person walks in the room? He becomes mysteriously quiet.
The best medicine against arrogance is the realization that God put us on this earth to achieve great things. We all want to be the one to hit the game-winning home run. If you acknowledge this need for greatness, you'll realize that no matter what you have done, you haven't yet begun to fulfill your potential.
For example, if you're involved in real estate, you're proud of the time you bought a property for $10,000 dollars and sold it for $25,000. But if the next guy turns around and sells it for a million, then you realize how much further you still have to grow.
An old proverb says "a fat cat can't run." If you become self-satisfied, then you are not likely to progress to greater accomplishments. You become complacent and stuck at that level forever.
Every time you feel yourself getting too proud, remind yourself what true greatness is, and how far you are from achieving your full potential. This will knock you back down to Earth. Then stop to take pleasure in how far you have come. This will balance you out again.

Thank you -- Good words!

I wonder how anyone can ever be self-satisfied. It really surprises me that so much of the world is all about "my life, car, friends, possessions, job, family....

None of it is ever enough. Even in Yahshua you wonder if you are enough until you realize you don't have to be in Him because He already achieved it for us. When we walk in Him, we are fulfilled because he's done it and will lead us to it too.

Talk is definitely cheap. I think the thing the satisfies, at least for a minute is approval from our Abba and bearing fruit that we can point too as having achieved something.