Take and eat and drink

St Ignatius of Antioch(107 AD), an early Church Father said that the Flesh and Blood of Jesus is the medicine of immortality, the antidote against death. Why is this true?

"He who feeds on My flesh and drinks My blood has (possesses now) eternal life, and I will raise him up [from the dead] on the last day. 

For My flesh is true and genuine food, and My blood is true and genuine drink."
(John 6:54-55 AMP)

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