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St. John the Evangelist, "the Apostle whom Jesus loved," was never canonized, and did not die by martyrdom, like the other Apostles did.
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Does that mean he's not a saint?
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Moses was not canonized.
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Jeremias and Isaias were not canonized.
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Nicodemus and Joseph of Arimathea and Ignatius of Antioch were not canonized.
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St. Joseph, foster father of Our Lord, was not canonized.