Other starting points for thinking about the church are common enough, of course. Denominational concerns override doxological ones; political arenas compete with the eucharistic assembly as the dwelling place of ecclesiology; sociologists or scientists become the doctors of the church. But the fact remains that the church itself is established only by ‘the upwards call of God in Christ Jesus,’ and that call is made concrete precisely in the eucharistic liturgy. Sursum corda! is the cry that heralds