This stimulating book helps us towards a greater understanding and love of the liturgy. There is more to the Church than the liturgy but there is nothing in the Church does not depend on it. This splendid treatment which is recommended enthusiastically can help greatly to make the liturgy a living and transforming reality. In elucidating the implications of our sacramental life the author makes expert use of the latest scriptural, patristic and theological studies. ‘You have shown yourself to me, Christ, face to face. I meet you in the sacraments.’ These words of St. Ambrose aptly describe the theme of the work which may well become a landmark in the current liturgical and theological renewal. Readers will also welcome the author’s excellent presentation of the teaching of Aquinas on the sacraments. Father O’Neill has written widely on sacramental and liturgical problems. He is Professor of Dogmatic Theology at Fribourg University, Switzerland.