I wish that age old saying "Don't be Greedy" be replaced with "Be Greedy!" I owe this to great writer Robert Kiyosaki and his book "Rich Dad Poor Dad".
Because of this "Don't be greedy" philosophy, we all feel guilty for our greed. However nothing can be achieved without a little bit of greed. We progress because we all desire something better in life. New inventions are made because be desire something better. We work hard because we want something extra. Greed is better than the feeing of guilt. Feeling of guilt makes us feel bad about ourself which robs our spirit while greed pushes us to work and results in progress. So be a bit greedy about everything in life! Too much greed, however, is bad as excess of everything is bad.