The simplest way of achieving peace and happiness in life is to heartily pray god every day, 'I don't want to hurt anybody in this world, by my mind, speech or action.'
Ahimsa (Non violence) is to maintain the awareness of not hurting any living being, even to the slightest degree, through one's mind, speech and actions.When this principle remains firm in your conviction and awareness then progress will occur in spirituality.
If one does not understand what constitutes the entire spectrum of ahimsa towards living beings, beginning with the visible to the subtlest, such as life-forms present in the air and water, and if one does not understand intent-violence (violence through inner intent which creates new karma) and intent-death (the ultimate of all violence: violence against the self), then whatever ahimsa one practices, will be in vain. One will be stuck at the level of mere words and gross mechanical actions.
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...