Whether expiation means atonement or purification (I find your explanation very unsatisfying) the point remains ... your view of the atonement of Christ is lacking. Does the blood of Christ cleanse us from all sin ... or just some sin? Seems the scriptures are clear that His blood cleanses us from all sin ... there is nothing left to purify if His atonement was perfect.
If you want to know how our works participate in the atonement of Christ ...
Works do not do anything wrt salvation ... salvation is a work of God, it is absolutely free, it is not earned or deserved.
Ephesians 2:8-9
8 For by grace you have been saved through faith; and that not of yourselves, it is the gift of God;
9 not as a result of works, that no one should boast.
And ... Titus 1:9
5 He saved us, not on the basis of deeds which we have done in righteousness, but according to His mercy, by the washing of regeneration and renewing by the Holy Spirit
Hebrews 10 talks about the one sacrifice that Christ made on the cross.
10 By this will we have been sanctified through the offering of the body of Jesus Christ once for all.
11 And every priest stands daily ministering and offering time after time the same sacrifices, which can never take away sins;
12 but He, having offered one sacrifice for sins for all time, sat down at the right hand of God,
13 waiting from that time onward until His enemies be made a footstool for His feet.
14 For by one offering He has perfected for all time those who are sanctified.
If that one offering on the cross has perfected us ... where is there room for purification? What the doctrine of purgatory does is negate the clear teaching of scripture on the atonement ... and it affirms that the sacrifice of Christ did not perfect us.
When the Bible is clear on a topic ... and you desire to add something to that ... you negate the text of the scripture and follow another gospel.
So what is your religion ...
Christian ... non-denominational.
yet surpisingly repeats every canard about the purgatory and atonement that the Protestans use to spread their lies?
I have simply challenged your understanding and interpretation of 1 Cor. 3 and presented a clear passage in Hebrews 10 to clearly show that the doctrine of purgatory is unbiblical ...
My main question still stands ...
Is your faith and trust in the sacrifice of Jesus Christ ... or is it in the teaching of the RCC?
The purgatorial purification is itself a part of the atonement. Remember, he is in purgatory only because his sin was already atoned for by Christ on the Cross. The question of his salvation is not resolved through the purgatory; it is merely entryway to Heaven.
Works do not do anything wrt salvation
Of course they do. The very passages you cite incompletely instruct us in the necessity of good works for our salvation if you read them completely. Read for example, down to Eph. 2:10 and Titus 3 (that is the one you cited, but misidentified) down to verse 9.
Let me summarize what the scripture teaches and what also the Church teaches. The salvation is by Grace of Jesus Christ alone (Eph 2:5-10) but it is not by faith alone: good works must accompany faith (Eph. 2:10, James 2:17:26). Good works, however, are never works of the law, or done for a temporal reward (Rm 3:28, Mt 6:5, 6:16). What are the good works? They are works of love done because of the Christian believer's ability to see Christ in every suffering, and they indeed save (Mt 25:31-46)
Is your faith and trust in the sacrifice of Jesus Christ ... or is it in the teaching of the RCC?
Christ gave me my Church, One, Holy, Catholic and Apostolic Church, which speaks with the voice of Christ and I listen.
he that receiveth whomsoever I send, receiveth me; and he that receiveth me, receiveth him that sent me (John 13:20).