Prayer before Christ the Lord sacramentally present extends the union with Christ which the faithful have reached in communion. It renews the covenant which in turn moves them to maintain in their lives what they have received by faith and by sacraments. They should try to lead their whole lives with the strength derived from the heavenly food, as they share in the death and resurrection of the Lord.

source: Congregation for Divine Worship, “Forms of Worship of the Eucharist: Exposition, Benediction, Processions, Congresses.”, 1973