The believer has no doubt that divine providence is at work always and everywhere. He knows that the outcome of human affairs does not depend on the power of the stars, for that power is non-existent, and that everything is ordered by the utterly equitable and merciful judgment and will of the supreme king. Nonetheless, things do not always work out as we desire, and the cause of the wicked often triumphs over that of the just. It is only too likely, then, that even generous souls may be disturbed and driven to wrongful complaints. Therefore, since few have such solid strength as not to be shaken by any shifts of circumstance and since prosperity no less than adversity leads many believers astray, we must be diligent in healing the wounds we receive because of our human weakness.
Saint Leo the Great