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Gal 5:2 Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing.
Gal 5:3 For I testify again to every man that is circumcised, that he is a debtor to do the whole law.
Gal 5:4 Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.
Gal 5:5 For we through the Spirit wait for the hope of righteousness by faith.
Gal 5:6 For in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.
How the Catholic Church Built Western Civilization.
Tom Woods superb book and series on EWTN: