One of my colleague introduce this book to me, it is called THE CONSOLATIONS OF PHILOSOPHY.
I came across this meaningful paragraph that I would like to share it with everyone.
In LIFE
There is only one inborn error, and that is the notion that we exist in order to be happy... So long as we persist in this inborn error... the world seems to us full of contradictions. For at every step, in great things and small, we are bound to experience that the world and life are certainly not arranged for the purpose of maintaining a happy existence... hence the counternances of almost all elderly persons wear the expression of what is called disappointment.
Disappointment is part of life, we do not exist only for happiness.