It was during the period covered by this volume that some of the most characteristic doctrines of the Roman Church were developed. In this development the whole sacramental system of the Church comes under consideration. The word "sacramentum" in the sense of a holy mark or sign (_sacrum signum_) was used with a very wide meaning as denoting anything "by which under the cover of corporeal things the divine wisdom secretly works salvation." Hugh of St. Victor, writing in the first half of the twelfth century, distinguishes three kinds of sacraments--those necessary for salvation, namely, baptism and the reception of the Body and Blood of Christ; those for sanctification, such as holy water, ashes, and such-like; and those instituted for the purpose of preparing the means of the necessary sacraments, that is, holy orders and the dedication of churches. Elsewhere he chooses out rather more definitely seven remedies against original or actual sin, namely, baptism, confirmation, eucharist, penance, extreme unction, marriage, and holy orders; and after the twelfth century the Church gradually restricted the use of the word Sacrament to these seven. There was much disputing among the schoolmen on the need of institution by Christ Himself. Peter Lombard, and after him Bonaventura, denied this necessity; Albertus Magnus and Thomas Aquinas asserted it. But how account for extreme unction and confirmation? This is St. Thomas' explanation. "Some sacraments which are of greater difficulty for belief Christ himself made known; but others He reserved to be made known by the Apostles. For sacraments belong to the fundamentals of the law and so their institution belongs to the law-giver. Christ made known only such sacraments as He Himself could partake. But He could not receive either penance or extreme unction because he was sinless. The institution of a new sacrament belongs to the power of excellence which is competent for Christ alone: so that it must be said that Christ instituted such a sacrament as confirmation not by making it known, but by promising it." [Sidenote: The Eucharist.]