If we learn anything from the peace that is in us, it is that it represents the highest good to which no only persons but whole people can be called, and we cannot be content with our own serenity and, at the same time, indifferent to the swirls of anger that threaten to rend the fabric of society all around us. To do so would be to make of ourselves hypocrites, content to save ourselves and lose the world.
Nothing is more difficult than prayer. In all other tasks of spiritual life, however exacting, one can sometimes rest, but there is no rest in prayer, up to the end of one's life.