To get rid of the darkness of sorrow, you have to light the lamp of happiness. To dispel the darkness of disease, you have to install the light of health. To get over the darkness of losses and failures, you have to usher in the light of prosperity. These apparently opposing conditions are not totally separate from each other. They are interrelated. You see in the world the prevalence of heat and cold. They appear to be opposed to each other. But nevertheless, according to the prevailing situation, both are useful for man. During the cold weather, we welcome heat. In the summer, coolness is desired. Hence, it is clear that both heat and cold are aids to man and not harmful to him. Likewise, joy and sorrow, loss and gain are helpful to man and not inimical. If there is no sorrow, one cannot know the value of happiness. If there is no darkness, the value of light cannot be appreciated. Hence, if the greatness of light is to be realised, darkness is necessary. – Divine Discourse Nov 05, 1991.