Exactly. People grow in holiness, even though Jesus’ sacrifice to the Father was completed long ago.
So why does a person’s growth in holiness in Purgatory conflict in any way with the fact that Jesus’ sacrifice to the Father was completed long ago?
Probably because there is no purgatory...It's another fabrication of your religion...
Joh 5:24 Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.
2Co_5:8 We are confident, I say, and willing rather to be absent from the body, and to be present with the Lord.
I guess that means that Paul wasn't willing to be in purgatory (since he didn't mention it) or purgatory doesn't exist...