The line of our life is a curve,which is always up and down.Some people thought that the rich are always happy in their life.But this is not always true.They also have some problems.A poor man can much happier then rich.It is depend on how you utilize your present.
The straight life line is not good.For example a patient in a hospital, if the line of the machine is up down then the patient is alive otherwise he was died.
So every people should try to do their best in present.Then they can happy more than others(some time may not).