Peace is simplicity of heart, serenity of mind, tranquility of soul, the bond of love. Peace means order, harmony in our whole being; it means continual contentment springing from the knowledge of a good conscience; it is the holy joy of a heart in which God reigns. Peace is the way to perfection, indeed in peace is perfection to be found. The devil, who is well aware of all this, makes every effort to have us lose our peace.

—from the book The Joyful Spirit of Padre Pio: Stories, Letters, and Prayers