Some people are negative and hard it find to get out of that negative vibration.
Light from eternity, which is pure love, joy, bliss is melts away all those line of attentions that make you unhappy and depressed.
Some people are unhappy because they know there is more meaning to life. They are searching and have the potential to understand what they were searching for which is Enlightenment.
Those that are searching for meaning in life are those that have lost the connection to light. Once you reconnect to light and eternity the bliss, love, joy will return and depression will melt away and become happy and joyful.