42 St. Cyprian too, in the course of laying stress on the Church's unity in opposition to schism, said this: "Finally the Lord's sacrifices proclaim the unity of Christians who are bound together by a firm and unshakeable charity. For when the Lord calls the bread that has been made from many grains of wheat His Body, He is describing our people whose unity He has sustained; and when He refers to wine pressed from many grapes and berries as His Blood, once again He is speaking of our flock which has been formed by fusing many into one." (45)
Source: Mysterium Fidei (Vatican.va)