As with all things in the physical plane, nothing is permanent, and the only thing we can truly count on is change. Things come and go, people are born and die and move in and out of our lives. The dreams and goals of today will one day either materialize or evolve into something different with time. If we become rigidly attached to any of this, we set ourselves up for the inevitable suffering that will ensue when the thing, person or idea flows out of our lives, or our desire for it shifts.