Augustine of Hippo

And thus the devil, the prince of the impious city, when he stirs up his own vessels against the city of God that sojourns in this world, is permitted to do her no harm. For without doubt the divine providence procures for her both consolation through prosperity, that she may not be broken by adversity, and trial through adversity, that she may not be corrupted by prosperity; and thus each is tempered by the other, as we recognize in the Psalms that voice which arises from no other cause, "According to the multitude of my griefs in my heart, Thy consolations have delighted my soul." Hence also is that saying of the apostle, "Rejoicing in hope, patient in tribulation."