But the scanty wisdom of man, on entering into an affair which looks well at first, cannot discern the poison that is hidden in it, as I have said above of hectic fevers. Therefore, if he who rules a principality cannot recognize evils until they are upon him, he is not truly wise; and this insight is given to few. And if the first disaster to the Roman Empire[5] should be examined, it will be found to have commenced only with the enlisting of the Goths; because from that time the vigour of the Roman Empire began to decline, and all that valour which had raised it passed away to others.