Be thankful for what you have; you'll end up having more. If you concentrate on what you don't have, you will never, ever have enough.
Appreciate effort, sometimes you just don't know what they had to go through just to keep you happy.
The more we explore, understand, and even come to appreciate our own self-destructive mental attitudes, the more control we gain over our minds.
Happiness is the result of our perception. If we focus on lack we will never find contentment. If we focus on what we have in joyful appreciation, suddenly the world becomes our footstool.