[Part 3/End]
"Made perfect" here is referring to
setting one's guilty record straight. The deeds/works (
see post above) can't do this, only faith in Messiah can.
The Galatians started through faith in Messiah for CLEARING THEIR GUILTY RECORD with Almighty, yes...but then started going back to the "placeholder" remedies for clearing record (i.e. the sacrifices, rituals, fleshy circumcisions, separations, death of offending party, etc.).
This is why Paul rebuked Peter earlier in the chapter, because he also started
separating himself from gentile believers as if they were "unclean" again. That's a placeholder cleansing rite that prophesied Messiah's cleansing work. It had nothing to do with the portion of your quote in red. Paul gives the context.
These things are NOT Paul preaching against the law (as explained above).
Paul is explaining that the law was wasn't given
to set a person right. No law given in any society is done so
to set a person right. Law is given to show what crime/sin is. The acts of the law were then added as placeholders to prophesy what the Messiah would do
to actually set a person right.
Anyone who still tries to do those placeholders to set themselves right are not believing in the Messiah and so are still guilty.
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Once one is set right through faith in Messiah (Justification) they are expected to obey the commandments in their rightness using the gifts and guidance of the Holy Spirit and Grace (Sanctification). Then when Messiah comes those who are sanctified will receive the reward (Glorification), while the rest who just had faith (Justified) but aren't sanctified will still get through but won't get the reward.