Here is a story
There once was a demon who was always raging against the world.
There seemed to be no end to the demons greed and anger.
One day the demon saw destruction that was not of his creation, and he remembered the Buddha’s teaching.
As a result of this; the demon became a devout protector of Buddhism.
Thanks to his good karma gained through protecting the Buddha’s law, the demon was reborn as a human being, and was able to become enlightened.
With the right aspiration, anyone can realize Buddha.
In gratitude for the teachings.