Why do we need purgatory if our sins are washed away by the blood of Jesus?

My 18 yr. old son asked a question I wasn’t sure how to answer- help! He’s grappling with the concept of purgatory and I mentioned Revelation 21:27, talked about temporal punishments remaining even though our sins are forgiven, etc. Then he asked: Why would we need further cleaning if 1 John 1:7 says we are washed clean in the blood of Jesus? How do I answer this?

The following links should help answer your questions about Purgatory. If you have any further questions, please contact Catholic Answers directly.

Recommended Reading:

[LIST]
*] Purgatory
*] The Roots of Purgatory
*]Do Catholics still believe in purgatory?
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