It was an argument for educated and simple. When St. Ambrose would convert the cultivated reason of Augustine, he bade him study the book of Isaiah, who is the prophet, as of the Messiah, so of the calling of the Gentiles and of the Imperial power of the Church. And when St. Cyril would give a rule to his crowd of Catechumens, "If ever thou art sojourning in any city," he says, "inquire not simply where the Lord's house is, (for the sects of the profane also make an attempt to call their own dens houses of the Lord,) nor merely where the Church is, but where is the Catholic Church. For this is the peculiar name of this Holy Body, the Mother of us all, which is the Spouse of our Lord Jesus Christ."[256:1] "In the Catholic Church," says St. Augustine to the Manichees, "not to speak of that most pure wisdom, to the knowledge of which few spiritual men attain in this life so as to know it even in its least measure,--as men, indeed, yet, without any doubt,--(for the multitude of Christians are safest, not in understanding with quickness, but in believing with simplicity,) not to speak of this wisdom, which ye do not believe to be in the Catholic Church, there are many other considerations which most sufficiently hold me in her bosom. I am held by the consent of people and nations; by that authority which began in miracles, was nourished in hope, was increased by charity, and made steadfast by age; by that succession of priests from the chair of the Apostle Peter, to whose feeding the Lord after His resurrection commended His sheep, even to the present episcopate; lastly, by the very title of Catholic, which, not without cause, hath this Church alone, amid so many heresies, obtained in such sort, that, whereas all heretics wish to be called Catholics, nevertheless to any stranger, who asked where to find the 'Catholic' Church, none of them would dare to point to his own basilica or home. These dearest bonds, then, of the Christian Name, so many and such, rightly hold a man in belief in the Catholic Church, even though, by reason of the slowness of our understanding or our deserts, truth doth not yet show herself in her clearest tokens. But among you, who have none of these reasons to invite and detain me, I hear but the loud sound of a promise of the truth; which truth, verily, if it be so manifestly displayed among you that there can be no mistake about it, is to be preferred to all those things by which I am held in the Catholic Church; but if it is promised alone, and not exhibited, no one shall move me from that faith which by so many and great ties binds my mind to the Christian religion."[257:1] When Adimantius asked his Marcionite opponent, how he was a Christian who did not even bear that name, but was called from Marcion, he retorts, "And you are called from the Catholic Church, therefore ye are not Christians either;" Adimantius answers, "Did we profess man's name, you would have