Daniel Prokop said this quote

There are some people that see the half full cup and get upset about where the other half of the cup went... With an attitude like that, they will never be happy. I see a half full cup and I immediately take half of someone else’s cup and then I have a full cup and I’m happy. With the right attitude, life is really very simple. Peter Pan from 'Leaving Neverland' (Why Little Boys Shouldn't Run Big Corporations)