John Chrysostom
This blessedness, which is far greater than forgiveness of sins, does it belong to circumcision or to uncircumcision? The question, then, is this: with what is this great good, blessedness, connected, with circumcision or with uncircumcision?
Notice the character of his speech. The Apostle proves that blessedness is not only not foreign to uncircumcision, but is more compatible with it than with circumcision. David himself, who calls blessed the one who received forgiveness of sins, was circumcised and speaks to the circumcised. Therefore notice what skill Paul showed in applying David's words to the uncircumcised.
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Having joined blessedness to righteousness and proved that the two are one, the Apostle examines how Abraham was justified. If blessedness belongs to the righteous man, and Abraham was justified, then let us see when he was justified. Was it while he was still uncircumcised, or when he was already circumcised?
While he was uncircumcised, says the Apostle: Rom 4:10, "How then was it counted to him? Was it while he was circumcised, or uncircumcised? Not while circumcised, but while uncircumcised."