It is a well-known fact that many a modern eucharistic prayer shows signs of handling the relationship between Supper and Calvary with due care, even with some creative ambiguity. For some, indeed, the very concept of offering is fraught with problems which can only be faced in liturgical formulae by having recourse to paradox. The bread and wine are on the table, but they are neither ‘offered’ sacrificially, nor are they ‘held back’ from the good purposes of God. The act of memorial is neither a re-enactment of Calvary nor is it an insignificant feature of the Church's life, as if all the eucharistic community did was to bask in the sunshine of Christ's single offering, and that is that. Yet many modern prayers are the direct result of creative movements such as liturgical research, patristic theology, and the rapprochment between the Churches that has been so much part of twentieth-century history.