Pope John Paul II This encyclical is the latest study of the Pope on the theology and importance of the Eucharist. Topics include: The theology of the Eucharist The importance of the Eucharist in the life of the Church The relationship between the priesthood and the Eucharist The Eucharist as a point of unity - and separation - among Christians The importance of the liturgy and following liturgical norms Mary as an example of our relationship to Jesus in the Eucharist