When All the things in the world does not mean anything to you.
When you no longer care for you job, increment or promotion.
When you no longer care how much money have made and how much you can make.
When you no longer care for social status or pride.
When you no longer need any position or recognition.
When you no longer care whether you are right or you are wrong.
When you don't care what others think about you.
And when staying alive becomes the most important thing in life.
That is my friend When you realize how beautiful the life is.