A sacramental celebration is woven from signs and symbols. In keeping with the divine pedagogy of salvation, their meaning is rooted in the work of creation and in human culture, specified by the events of the Old Covenant and fully revealed in the person and work of Christ.
Signs of the human world. In human life, signs and symbols occupy an important place. As a being at once body and spirit, man expresses and perceives spiritual realities through physical signs and symbols. As a social being, man needs signs and symbols to communicate with others, through language, gestures, and actions. the same holds true for his relationship with God.
God speaks to man through the visible creation. the material cosmos is so presented to man’s intelligence that he can read there traces of its Creator. Light and darkness, wind and fire, water and earth, the tree and its fruit speak of God and symbolize both his greatness and his nearness.
Inasmuch as they are creatures, these perceptible realities can become means of expressing the action of God who sanctifies men, and the action of men who offer worship to God. the same is true of signs and symbols taken from the social life of man: washing and anointing, breaking bread and sharing the cup can express the sanctifying presence of God and man’s gratitude toward his Creator.
The great religions of mankind witness, often impressively, to this cosmic and symbolic meaning of religious rites. the liturgy of the Church presupposes, integrates and sanctifies elements from creation and human culture, conferring on them the dignity of signs of grace, of the new creation in Jesus Christ.
Signs of the covenant. the Chosen People received from God distinctive signs and symbols that marked its liturgical life. These are no longer solely celebrations of cosmic cycles and social gestures, but signs of the covenant, symbols of God’s mighty deeds for his people. Among these liturgical signs from the Old Covenant are circumcision, anointing and consecration of kings and priests, laying on of hands, sacrifices, and above all the Passover. the Church sees in these signs a prefiguring of the sacraments of the New Covenant.
Signs taken up by Christ. In his preaching the Lord Jesus often makes use of the signs of creation to make known the mysteries of the Kingdom of God. He performs healings and illustrates his preaching with physical signs or symbolic gestures. He gives new meaning to the deeds and signs of the Old Covenant, above all to the Exodus and the Passover, for he himself is the meaning of all these signs.
Sacramental signs. Since Pentecost, it is through the sacramental signs of his Church that the Holy Spirit carries on the work of sanctification. the sacraments of the Church do not abolish but purify and integrate all the richness of the signs and symbols of the cosmos and of social life. Further, they fulfill the types and figures of the Old Covenant, signify and make actively present the salvation wrought by Christ, and prefigure and anticipate the glory of heaven. Words and actions
A sacramental celebration is a meeting of God’s children with their Father, in Christ and the Holy Spirit; this meeting takes the form of a dialogue, through actions and words. Admittedly, the symbolic actions are already a language, but the Word of God and the response of faith have to accompany and give life to them, so that the seed of the Kingdom can bear its fruit in good soil. the liturgical actions signify what the Word of God expresses: both his free initiative and his people’s response of faith.
The liturgy of the Word is an integral part of sacramental celebrations. To nourish the faith of believers, the signs which accompany the Word of God should be emphasized: the book of the Word (a lectionary or a book of the Gospels), its veneration (procession, incense, candles), the place of its proclamation (lectern or ambo), its audible and intelligible reading, the minister’s homily which extends its proclamation, and the responses of the assembly (acclamations, meditation psalms, litanies, and profession of faith).
The liturgical word and action are inseparable both insofar as they are signs and instruction and insofar as they accomplish what they signify. When the Holy Spirit awakens faith, he not only gives an understanding of the Word of God, but through the sacraments also makes present the “wonders” of God which it proclaims. the Spirit makes present and communicates the Father’s work, fulfilled by the beloved Son.
From the Catechism of the Catholic Church 1145-1155