Pope John XXIII
Aeterna Dei Sapientia §45
The Magisterial Prerogative of St. Peter and His Successors
45 Applied to St. Peter this pronouncement is clear and emphatic enough; yet unhesitatingly St. Leo claims the same prerogative for himself. Not that he wanted worldly honor, but he had no doubt whatever that he was just as much Christ's vicar as was the Prince of the Apostles. Consider, for example, this passage from his Sermons:—
Source: Aeterna Dei Sapientia (Vatican.va)