Suffering is not bad. If you understand it rightly, suffering is a cleansing. If you understand it rightly, sadness has a depth to it which no happiness can ever have. A person who is simply happy is always superficial. A person who has not known sorrow and has not known sadness, has not known the depths. He has not touched the bottom of his being; he has remained just on the periphery. One has to move within these two banks. Within these two banks flows the river.

— Osho