Internal peace is an essential first step to achieving peace in the world. How do you cultivate it? It's very simple. In the first place by realizing clearly that all mankind is one, that human beings in every country are members of one and the same family.
Whether we consider the individual, family, local, national or international level, peace must arise from inner peace. For example, making prayers for peace while continuing to harbor anger is futile. Training the mind and overcoming your anger is much more effective than mere prayer. Anger, hatred and jealousy never solve problems, only affection, concern and respect can do that.
Kindness is the key to peace and harmony in family life.