Who is responsible for Peace?

I am a Christian – is it only Christians?  Are only [fill in the blank] those who can pray and have God hear them?

Desmond Tutu is the kind of Christian I like to be associated with, and I love what he says in these two videos.  Who has responsibility for peace?  (Of course, the answer is All Of Us)  And why are we different?  (Because we’re supposed to be)