The Eucharist is the source and summit of the Christian life. The Eucharist in salvation history: Melchizedek's offering, the Passover, the manna. Jesus' "bread of life" discourse, the Last Supper, and the Paschal Mystery. The Eucharist is thanksgiving to the Father, the memorial of the Messiah's Passover and sacrifice of the Church, and the Real Presence of Christ among us. Transubstantiation. Eucharistic adoration. Preparation before receiving the Eucharist. The fruits of Holy Communion. The Eucharist and the unity of Christians. The Paschal banquet: the Eucharist is an anticipation of heavenly glory.