Biggest tragedy in life

What is the biggest tragedy in life?
Somebody will tell it is death.....but how it will be?
....................................NO...........................
Biggest tragedy in life is the condition when we are unable to use our ability...our thinking power.......
Means when we are like a machine...This is the biggest tragedy in our life....
Try to escape from that..and utilize your life.....Otherwise what is the meaning of "living" in this world.
Just like a robot....doing same work daily.......Think like a human...not like a machine........Do work like a human...with out any proud.....Think always we are living in earth..............