Peace of mind has nothing to do with the external world; it has only to do with our connection with God. Love really is the answer. We're here only to teach love. When we're doing that, our souls are singing and dancing. When we remind ourselves that we are spiritual beings, that life and love are the flame eternal, that's when our soul is nourished.
The power of appreciation comes through actions. Feeling gratitude creates a wonderful internal experience; expressing it allows us to feel the full bloom of appreciation. Most significant would be our willingness on a moment-to-moment basis to find some aspect of every person and event to appreciate and then find a tangible way to express our gratitude.