What's the origin of the process of anger (rage)?

Answers from the books of Samael Aun Weor

Frustration, fear, doubt and guilt originate the processes of anger. Frustration, fear, doubt and guilt cause anger. Whoever liberates himself from these four negative emotions will dominate the world. To accept negative passions is something that goes against self-respect.

Anger is of crazy persons, it serves no purpose, It leads us to violence. The goal of violence is to lead us to violence and the latter produces more violence.

Samael Aun Weor. Excerpt  from the Book: The Revolution of the Dialectic