Why do we believe that the Eucharistic bread and wine are Jesus’ body and blood?
We believe because we are followers and disciples of Jesus! He himself demanded our belief and participation in the Eucharistic meal of his Body and Blood. (see John 6:22-71)
The life of Jesus – from his Incarnation and Nativity in Bethlehem, to his miracles and preaching in Galilee, to his Passion, Death and Resurrection in Jerusalem – do us absolutely no good apart from the Eucharist. Why? Because it is in the Eucharist that we are joined with Jesus to his Cross and that we receive a share of his glory in Heaven. Saint Paul asks us to remember: “are not those who eat the sacrifices partners in the altar?” (1 Corinthians 10:18)
Therefore, those who refuse to believe and do not partake of the Eucharist in faith, are not partners of Jesus. They are left dead in their sins, like the “many of his disciples [who] drew back and no longer walked with him.” (John 6:66)
If this seems like a hard teaching for you, do not be discouraged! Saint Peter also struggled at one time. But follow his example! When at first he did not understand Jesus, he did not draw back like the faithless disciples. Instead, he drew even closer to Jesus by affirming his faith in the “Holy One of God.” (John 6:68-69)