For— It is most evident that γαρ, for, cannot here signify that the following words are a reason for what was asserted in those immediately preceding. It seems little more than an expletive, as the particle now is frequently among us. Circumcision is here put for being a Jew, as being one of the chief, and most discriminating rites of that people: It profiteth, says St. Paul, (or, as it may be rendered, It is indeed an advantage,) if thou keep the law.
Related Commentaries of Romans 2:25
Romans 2:25
25 For circumcision verily profiteth, if thou keep the law: but if thou be a breaker of the law, thy circumcision is made uncircumcision.