I'd like to share another excerpt from the wonderful book, Heaven's Face, Thinly Veiled: A Book of Spiritual Writing by Women. This one is from Elizabeth Kubler-Ross, best known for her writings on the grieving process. Here, she talks about finding inner peace and presents a lengthy quote by Black Elk:
The first peace, which is the most important, is that which comes within the soul of men when they realize their relationship, their oneness with the universe and all its powers, and when they realize that at the center of the universe dwells Wakan-Tanka (God) and that this center is really everywhere; it is within each of us.
This is the real peace, and the others are but reflections of this. The second peace is that which is made between two individuals, and the third is that which is made between two nations. But above all you should understand that there can never be peace between nations until there is first known that true peace which . . . is within the souls of men.
The rest of her essay, actually a chapter in her book On Children and Death, discusses how we avoid peace and choose unhappiness because we are not being honest about what is within us. Good reading.