An evil seed is planted when you feel envy whatever is money, a car, the couple in love or just the smile someone carry.
When you compete to have the same, the seed grows slowly.
When you do whatever you can to steal it from that person, to have it for yourself, evil already overtook you.
When you finally took it for yourself, after hurting someone on the way, evil won! And you become part of the living Devil's army.
Earth is very dirty. There's no one place clean in earth. What seems clean is infested with microscopic living matter eating others. Even in the air we breath.
Everywhere in the world living beings are eating each other for survival.
The smartest and the dominamt ( humans) are eating the small and the bigger animals, but they are surrounded by the invisible microscopic even in the places they feel safe. like their bed. The comfort they built, is in the end a perfect nest for the thriving of the microscopic.
The smallest win them all. There's no threaten for what you can't see.