Ahimsa gives rise to tolerance. Have you ever felt like hitting somebody? Why is that violence arising in your mind? What is the source of the violence? As you watch the source of violence, you will see that violence disappears, dissolves and peace dawns. Yoga brings that inner peace which in turn establishes non-violence. Practice of non-violence is two-way traffic. Ahimsa or non-violence brings about the union of the mind or peace of mind and when you are peaceful or calm within, you naturally become non-violent.