Instituted in 1264 and falling on the Thursday after Trinity Sunday, the feast of Corpus Christi celebrates Christ’s institution of the Eucharist. A number of the texts we use to celebrate the Eucharist emphasise the communicant’s unworthiness to receive Christ’s body and blood: for example, ‘Lord, I am not worthy to receive you’ and ‘We are not worthy so much as to gather up the crumbs under thy table’.