In one short statement, it encompasses everything you'd want for yourself and for others. What you give to others, they'll give it back to you..."peace be with you...and also with you".
It's actually one of my favorite parts of the Mass. People are shaking hands, nodding, smiling at one another. Loved ones hug and kiss. Having an entire congregation wishing one another peace...wow! I can only imagine the level of good will generated, even among total strangers.
Maybe it will do all of us some good to constantly think that way.