Some there are who keep themselves in peace and have peace also with others.
And there are some that are neither at peace within themselves, nor suffer others to be at peace; they are troublesome to others, but always more troublesome to themselves.
And some there are who keep themselves in peace and study to restore peace to others.
Yet all our peace in this miserable life is rather to be placed in humble sufferings than in not feeling adversities.
He who best knows how to suffer will enjoy the greatest peace.
Such a one is a conqueror of himself and lord of the world, a friend of Christ, and an heir of Heaven.
The Imitation of Christ, Thomas à Kempis, Book II, Chapter 3.3