This indifference comes when the nature of the world is understood; it is the higher knowledge. Then it is understood that all those objects to which one attached so much importance, which one strove to attain, to achieve, are not important. Before reaching that stage a person attaches too much importance to his joys, to his sorrows. If he is sad the whole world is full of sadness; if he is a little joyful the whole world is full of joy - as if the sun would rise and set according to his joy and sadness.