If you asked someone to define hatred, they would probably give you examples of the outward signs of hate. However, hatred is a complex emotion and has many components. It is also like a poison to the soul and is a destructive force, both inward and outward.
Hatred is an emotion, but not a simple one. It can have components of resentment, anger, and aggression. The root of hatred is almost always fear. It is often a response to a perceived threat, even if this threat is imaginary. When someone is consumed by hatred, they will either express it inwardly or outwardly. Hate directed toward others is its most destructive form.