The inner stillness of a person who truly "is peace" brings peace to the whole interconnected web of life, both inner and outer.
When the whole consciousness is silent and tranquil, free from all becoming, which is spontaneity, then only does the immeasurable come into being. For, when the mind is still, reality, the indescribably, comes into being. So the mind must be simple, unburdened by belief, by ideation. And when there is stillness, when there is no desire, no longing, when the mind is absolutely quiet with a stillness that is not induced, then reality comes. And when that happens, it is a blessing.