When we consider what we have, we are always happy. But somehow, when we begin to think what we don't have, we are never satisfied. Isn't it better not to go there in the first place?
In Zen, there is a well-known saying: "Houken wa te ni ari."
"The Treasure Sword is in your hand." Everyone searches of their "treasure sword" (wisdom) yet, it is something which we already possess in our own hearts.
In the early days of the dojo, we were so poor and many times there was no money at all to even pay the bills. As it often happens, one weekend there was not a penny at all, so I just stayed in the dojo and did not go out or do anything at all. The next day, when I started to do my laundry, I found a ten-dollar bill in my back pocket. I thought I had no money to go out and buy myself some groceries to eat, not knowing the money was there right in my pocket. I could do nothing at all. I was not stopped by the lack of a little money but my lack of "understanding."
More often than not, we have everything we need to be happy but not realizing we already possess this "treasure sword," we are unhappy and complain about this and that.