Everything has an end point where it stops to work nothing remains constant. Even this world is not permenant where we have planned our future lives. It's a rule of nature from the begning that the thing that starts one day reaches at an end.
Eventhough our life is not permenant, it will end soon might be after some years but it will. Sun rises and it sets in evening as well as so it shows that it also has an end. Ocean and rivers also has an end. If something starts and ends then it is not real because reality is constant for forever that none can deny.
If our lives and the world in not permenant then where is the reality and what it is?. Perphaps ! beyond the oceans and rivers there must be something real or might be ahead of shiny stars that shine in the darkness of night.