We know joy when we are happy to take from life what is given. When we experience the joy of the soul and higher states of consciousness, this joy is the essence of completion and fulfillment. There is nothing that can add to it or take away from it. Joy is our natural state.
When you turn within you think you see a light. What you think is the light that you see in the inner world is the light that sees, not the light that can be seen. This is a different kind of light, not the kind of light that can be radiated from a source. This is the all-pervading light. Think of yourself as that light, then your aura will burn more brightly.