Can the Catholic Church change its doctrine?

In John 6:54 “he who eats my flesh and drinks my blood has a eternal life. And I will raise him up on the last day.” What about those who don’t eat his flesh and drink his blood? Do they have eternal life?

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**Recommended Reading:
*]Can Dogma Develop?
*]Can Doctrine Develop? (Radio Shows)
*]Is It a Doctrine or a Discipline?

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