great expectations versus all things good

Is not having any expectations really the solution to being disappointed all the time?

I hear people say that if you don't have any expectations you minimize your disappointment when things don't go your way. You can feel pleasantly surprised by whatever comes your way. Everything becomes a gift; something above and beyond.

I can see the logic, but is disappointment really such a tragedy? If there is nothing in which to strive, where is the hope? If you have nothing to set your sights on, aren't you setting yourself up for the status quo, mediocrity, and ultimate failure?

I know that disappointment will follow too high expectations, but I also know that expecting great things keeps me moving.

I am trying to find a healthy balance between optimism, hope, obsession and the superior let-down.