The killing of animals, insects and smaller life-forms is called effect violence. And to inflict mental anguish on others or to become angry with others is intent-violence. No matter how hard one tries, it is not easy to practice non-violence. In fact the real violence is anger, false pride, attachment and greed. Effect violence continues according to the laws of nature and no one has any control over it.
Kashaya (bad intent, action or speech) is the highest violence and that is why the Lord has said that first and foremost, one should not have any kashaya. This type of violence is called self-violence or intent-violence.
There are those who take a firm stand to stop the effect-violence. They may be able to stop killing insects overtly. However if they use their intellect to take advantage of others in their business dealings, they are continuing intent violence through their greed. This is all violence!
Find more about violence (Himsa) and non-violence (Ahimsa), from the gross to the subtlest levels as exposed by the Gnani Purush (Spiritual Scientist) himself.
This read will, without doubt, serve as a very useful guide for those who want to practice Non-Violence (Ahimsa) and desire liberation...