The ghosts of desperation and lust and envy hide in the shadow of our yearning. Be it money, material possessions, or accolades, we are haunted by our aspirations. After all, we become what we desire.
Covet that shiny new truck, that next big promotion, that beautiful man or woman, and you will feel unspeakable pain until it/he/she is yours. When your desire is met, however, your flame is not extinguished. No, you are instead filled with brand new desires, a never-ending cycle.
The key, then, is to aspire toward something meaningful. Instead of jonesing for things, we must pursue those which are without definitive milestones: growth, contribution, love.
These qualities are self-fulfilling: Seek growth and you will grow. Endeavor to give to others and you will, by definition, contribute beyond yourself. Love others and your cup will overflow with the love you give.
It is not wrong to have aspirations, desires, goals. But it is wrong for us to imagine that we can ever satiate our ever-growing need for more.