10. Also in that at the beginning of the ceremony the husband giveth a ring to the bride, this is done as a sign of mutual love, or rather in order that their hearts may be united by the same pledge. And the same ring is put on the fourth finger, because (as some say) a certain vein runneth through it which reacheth to the heart. Also one Protheus is said to have first made a ring of iron as a pledge of love, and to have enclosed an adamant therein: and from this he founded the custom of betrothing brides, because as iron subdueth all things, so doth love conquer all things, since nothing is more violent than its ardour. {157} 11. And as an adamant cannot be broken, so love cannot be overcome: for love is as strong as death. Therefore also he founded the custom of putting the ring on the ring-finger through which a vein passeth to the heart. Afterwards, however, golden rings were substituted for iron, and were set with gems, instead of adamant, because as gold excelleth other metals, so doth love excel all other blessings. And as gold is set off by the gems, so is conjugal love by other virtues. But the word _nuptials_ (marriage) is so called according to Ambrose, a _nubendo_ (from covering the head). For brides are wont to veil the head and abstain from speaking. Whence also Rebecca, when she saw Isaac to whom she was about to be espoused, began to veil her face. For bashfulness ought to precede marriage, inasmuch as bashfulness more highly commendeth wedlock itself: and the bride should appear rather to be sought by the husband, than herself to have sought after him. . . . 12. We have further to note that a threefold spiritual sacrament is signified by the consummation of marriage. The first sacrament is the spiritual union of the soul to God, through faith, love, and charity; or the union of will, namely charity which consisteth in the spirit, between God and a just soul. Whence saith the Apostle, 'but he that is joined unto the Lord is one spirit.' [Footnote 554] This sacrament is signified by the union of soul which takes place at the first betrothal in carnal matrimony. The second is the union of the human nature with the divine, which took place in the incarnation of the Word of God; or the conformity of nature, which existeth in the flesh, between Christ and His Holy Church. To which that saying referreth, 'The Word was made flesh, and dwelt among us.' [Footnote 555] The third sacrament is the unity of the Church, gathered out of all nations and subjected to one spouse, namely Christ. This sacrament is typified in the case of such as, having had one wife and her a virgin, have afterwards been admitted into holy orders. [Footnote 554: I Corinthians vi, 17.] [Footnote 555: S. John i, 14.] {158}