101 The prescriptions in fact of the sacred liturgy aim, by every means at their disposal, at helping the Church to bring about this most holy purpose in the most suitable manner possible. This is the object not only of readings, homilies and other sermons given by priests, as also the whole cycle of mysteries which are proposed for our commemoration in the course of the year, but it is also the purpose of vestments, of sacred rites and their external splendor. All these things aim at "enhancing the majesty of this great Sacrifice, and raising the minds of the faithful by means of these visible signs of religion and piety, to the contemplation of the sublime truths contained in this sacrifice."
Source: Mediator Dei (Vatican.va)