Gestures too involve our bodies in prayer. The most familiar of these is the Sign of the Cross with which we begin Mass and with which, in the form of a blessing, the Mass concludes. Because it was by his death on the cross that Christ redeemed humankind, we trace the sign of the cross on our foreheads, lips and hearts at the beginning of the Gospel. Fr. Romano Guardini, a scholar and professor of liturgy wrote of this gesture:
When we cross ourselves, let it be with a real sign of the cross. Instead of a small, cramped gesture that gives no notion of its meaning, let us make a large, unhurried sign, from forehead to breast, from shoulder to shoulder, consciously feeling how it includes the whole of us, our thoughts, our attitudes, our body and soul, every part of us all at once, how it consecrates and sanctifies us … (Romano Guardini, Sacred Signs , 1927)
But there are other gestures that intensify our prayer at Mass. During the Confiteor the action of striking our breasts at the words through my own fault can strengthen my awareness that my sin is my fault. In the Creed we are invited to bow at the words which commemorate the Incarnation: by the power of the Holy Spirit he was born of the Virgin Mary and became man. This gesture signifies our profound respect and gratitude to Christ who, though God, did not hesitate to come among us as a human being, sharing our human condition in order to save us from sin and restore us to friendship with God. This gratitude is expressed with even greater solemnity on the Feast of the Annunciation of the Lord and on Christmas when we genuflect at these words.
The Our Father is followed by the Exchange of Peace, the gesture which we express through a prayerful greeting of peace, that we are at peace, not enmity, with others. This exchange is symbolic. The persons near me with whom I share the peace signify for me, as I do for them, the broader community of the Church and all humankind.
Finally, with the new General Instruction, we are asked to make a sign of reverence, to be determined by the bishops of each country or region, before receiving Communion standing. The bishops of this country have determined that the sign which we will give before Communion is to be a bow, a gesture through which we express our reverence and give honor to Christ who comes to us as our spiritual food.
In addition to serving as a vehicle for the prayer of beings composed of body and spirit, the postures and gestures in which we engage at Mass have another very important function. The Church sees in these common postures and gestures both a symbol of the unity of those who have come together to worship and a means of fostering that unity. We are not free to change these postures to suit our own individual piety, for the Church makes it clear that our unity of posture and gesture is an expression of our participation in the one Body formed by the baptized with Christ, our head. When we stand, kneel, sit, bow and sign ourselves in common action, we given unambiguous witness that we are indeed the Body of Christ, united in heart, mind and spirit.