What is Peace?

What is it to be peaceful? Do we know? Is there a difference between inner peace and our outside expressions? How do we find inner peace, if there is such a thing? I think it is an important question for humanity to answer, for the inner IS the outer is it not? If we are genuinely peaceful inside then our actions will match and vice versa as you can watch and read the news. So one question is how does the individual "find" peace and how do we define "inner peace?" Is it how we think, about people, life circumstances, ourselves? And the next question is, even if you and I "find" peace, ask these questions, meditate on them, what good does that do the world, being only two people? How do we grow a more peaceful world, where people are peaceful inside and so peaceful in their actions?