Two loves have made two different cities: self-love hath made a terrestrial city, which rises in contempt of God; and Divine Love hath made a celestial one, which rises in contempt of self. The former glories in itself - the latter in God.
The Head and the body are Christ wholly and entirely. The Head is the only begotten Son of God, the body is His Church; the bridegroom and the bride, two in one flesh. All who dissent from the Scriptures concerning Christ, although they may be found in all places in which the Church is found, are not in the Church; and again all those who agree with the Scriptures concerning the Head, and do not communicate in the unity of the Church, are not in the Church.
As to those other things which we hold on the authority, not of Scripture, but of tradition, and which are observed throughout the whole world, it may be understood that they are held as approved and instituted either by the apostles themselves, or by plenary Councils, whose authority in the Church is most useful, e.g. the annual commemoration, by special solemnities, of the Lord's passion, resurrection, and ascension, and of the descent of the Holy Spirit from heaven, and whatever else is in like manner observed by the whole Church wherever it has been established.
In our own times, you see, an emperor came to the city of Rome, where there's the temple of an emperor, where there's a fisherman's tomb. And so that pious and Christian emperor, wishing to beg for health, for salvation from the Lord, did not proceed to the temple of a proud emperor, but to the tomb of a fisherman, where he could imitate that fisherman in humility, so that he, being thus approached, might then obtain something from the Lord, which a haughty emperor would be quite unable to earn.