When you think about your own past, you will always be able to draw power from the “light” you have placed there.
Unfortunately, it becomes more difficult if you have done too many “negative” deeds. The shadow will follow one into the present-time.
The clumsy thing is, the “shadow” will simply forbid you to think about many things in your past. If you avoid facing these memories, it is like crossing out your own time.
The foundation of existence will start to crumble.