Once a dog walked in to a room of mirrors, it looked at its own reflections in the mirrors surrounding it and thought it was being attacked by many dogs. It became frantic and started attacking the dogs in the mirror, it tiered itself in the act and fell unconscious.
After a while a man walked in to the room, he looked at his reflection in the mirror, saw his reflection and casually corrected his hair, saw the poor dog and took it out in to the open.
Each one of us knows that the person we see in the mirror is just a reflection. We fail to grasp the fact that the whole world we live in is just a reflection of our own self a projection of our senses. The happiness we feel is just reflective happiness and the sadness is also just a projection of our thoughts, prejudices and perspectives.
A wise man knows this and focus on realizing the true self by diverting his energy to his inner self using meditation, there lies the true happiness.