St. Ambrose: "The heavenly and venerable sacrament"

"THEREFORE dost thou hear that as often as sacrifice is offered, the Lord’s death, the Lord’s resurrection, the Lord’s ascension and the remission of sins is signified, and dost thou not take this bread of life daily? He who has a wound needs a medicine. The wound is that we are under sin; the medicine is the heavenly and venerable sacrament."

~St. Ambrose of Milan (333-397 A.D.): Treatise on the Sacraments, 5, 4, 25.

Institution of the Eucharist, by Fra Angelico.
Fresco, 1441-42; Convento di San Marco, Florence.