"But the true church is one, as by unity of doctrine, so by unity of government, and she is catholic also. Since God has placed the center and foundation of unity in the chair of Blessed Peter, she is rightly called the Roman Church, for 'where Peter is, there is the church.' 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.'" -His Holiness Pope Leo XIII, Testem Benevolentiae Nostrae (Concerning New Opinions, with Regard to Americanism) promulgated on January 22, 1899.