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.
Prayer is not sending in an order and expecting it to be fulfilled. Prayer is attuning yourself to the life of the world, to love, the force that moves the sun and the moon and the stars.