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>> “I believe the idea from the eastern point of view is...” <<
The Scriptural point of view is what matters.
The effective sacrifice of the sinless kinsman redeemer has been made. There is no reason to sacrifice now.
This is also why the Mass is a Satanic lie.
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Blame the person who said do this. By our understanding it is not a different sacrifice but a participation in the same sacrifice. The same priest acts sacramentally to make present the same victim sacramentally which is eternally offered to the Father.