How could you possibly find happiness when you relentlessly want more and never find properly appreciate what you have?
The Secret to Happiness Is 10 Specific Behaviors
Benjamin P. Hardy

Be happy with that you already have is may be the biggest concern. Some people are jealous and frustrated because they always want more without knowing why. By the time, they are usually isolated from others and their frustrations growth. Sharing, giving and loving are always beneficial for your own life, but you have to select those people who are already happy with that they already have.