Is of value
If you obey the law.
But if you break the law,
περιτομὴ μὲν γὰρ ὠφελεῖ ἐὰν νόμον πράσσῃς· ἐὰν δὲ παραβάτης νόμου ᾖς, ἡ περιτομή σου ἀκροβυστία γέγονεν.
Paul said that circumcision (περιτομὴ μὲν γὰρ) indeed is of value or a benefit (ὠφελεῖ), if you obey the law (ἐὰν νόμον πράσσῃς). But if you break the law (ἐὰν δὲ παραβάτης νόμου ᾖς), your circumcision (ἡ περιτομή σου) becomes uncircumcision (ἀκροβυστία γέγονεν). Paul now turned to the question of circumcision, that was a big problem among the early Christians with the Jewish and gentile Christians. Circumcision was a big deal among Jewish people. On the eight day after birth, the foreskin of the penis of the male child was removed. This was a sign of Jewish identity. Thus, a non-Jew had to have this action performed on them as an adult if he wanted to become a Jewish person. Paul was in favor of circumcision if you obeyed the law that you had been given as a Jewish male. Paul introduced the concept of uncircumcision when the word meant the foreskin of the male penis. As this word means the prepuce, foreskin, or uncircumcision, it also became a derogatory term also. What do you think about circumcision?