15 As for me, “I am not a prophet nor the son of a prophet,” yet I understand clearly thus much of the future, and I proclaim, both loudly and distinctly, that if we become changed, and bestow some care upon our souls, and desist from iniquity, nothing will be unpleasant or painful. And this I plainly know from the love of God toward man, as well as from those things which He has done for men, and cities, and nations, and whole populations. For He threatened the city of Nineveh, and said, “There are yet three days, and Nineveh shall be overthrown.” What then, I ask, Was Nineveh overthrown?
Was the city destroyed? Nay, quite the contrary; it both arose, and became still more distinguished; and long as is the time which has elapsed, it has not effaced its glory, but we all still celebrate and admire it even to this day. For from that time it has been a sort of excellent haven for all who have sinned, not suffering them to sink into desperation, but calling all to repentance; and by what it did, and by what it obtained of God's favour, persuading men never to despair of their salvation, but exhibiting the best life they can, and setting before them a good hope, to be confident of the issue as destined in any wise to be favourable. For who would not be stirred up on hearing of such an example, even if he were the laziest of mortals?
Source: Homilies on the Statues (New Advent)