The Sacrament of the Holy Eucharist is the most important part of the Holy Mass. It is an obligation for the Catholics to take this Sacrament because it is the Body and Blood of Christ. The bread and wine become the Body and Blood of Christ in the Consecration part where the Priest lift up and Bread then the Wine. Then the bread and wine will transform into his Body and Blood, but the form or look, the shape, the color and the taste will remain as Bread and Wine, this is called Transfiguration.