Smiling is very important. If we are not able to smile, then the world will not have peace. It is not by going out for a demonstration against nuclear missiles that we can bring about peace. It is with our capacity of smiling, breathing, and being peace that we can make peace.
Sometimes your joy is the source of your smile, but sometimes your smile can be the source of your joy.~Thich Nhat Hanh
James's comment: What a great reminder of the power of a smile to change the world. It is a gentle yet firm reminder that to obtain world peace we must start with ourselves. Smiling and breathing and forgiving ourselves are the foundation for leading a life that will have positive effects on others. A positive, constructive, peaceful attitude rubs off on others and is passed around to many.
There is a saying, "What we think upon grows." This may be positive or negative and we constantly have to work to breath deeply to keep ourselves in a positive mood as best we can. It is not always easy as I can attest but I see it as a worth while path with the best road toward personal and greater world peace.
I hope some of that made sense.
-Peace to all sentient beings and a smile to all things-