Father Deiss in this work helps us to discover the rich liturgical celebration of the Mass. He follows the Order of the Mass so that the reader might appreciate this structure and its rhythm, and he explains each part of the Mass with its rites and words. Some of these elements have their roots in the beginnings of Christianity, while others witness to the religious and cultural experience of Christianity through the centuries. Father Deiss tries to help us understand the meaning of the celebration today.