Aeterna Dei Sapientia §3

³ Wherein, then, lies the true greatness of this Pope? In moral courage?—in that moral courage which he showed when, at the River Mincius in 452, with no other armor to protect him than his high-priestly majesty, he boldly confronted the barbarous king of the Huns, Attila, and persuaded him to retreat with his armies across the Danube? That was certainly an heroic act and one which accorded well with the Roman pontificate's mission of peace. Yet we must think of it as but one isolated instance of a life-long activity of remarkable brilliance devoted to the religious and social welfare, not merely of Rome and of Italy, but of the whole Church throughout the world.