"Wherefore, if anybody wishes to be considered a real Catholic,
he ought to be able to say from his heart the selfsame words which
Jerome addressed to Pope Damasus: "I, acknowledging no other
leader than Christ, am bound in fellowship with Your Holiness; that
is, with the chair of Peter. I know that the church was built upon him
as its rock, and that whosoever gathereth not with you, scattereth."
-Pope Leo XIII, Testem Benevolentiae Nostrae, January 22, 1899