Galatians 6:15

In Christ Jesus - Under the dispensation of the Gospel, of which he is head and supreme, neither circumcision - nothing that the Jew can boast of, nothing that the Gentile can call excellent, availeth any thing - can in the least contribute to the salvation of the soul.

But a new creature - Αλλα καινη κτισις· But a new creation; not a new creature merely, (for this might be restrained to any new power or faculty), but a total renewal of the whole man, of all the powers and passions of the soul; and as creation could not be effected but by the power of the Almighty, so this change cannot be effected but by the same energy; no circumcision can do this; only the power that made the man at first can new make him. See the note on 1 Corinthians 7:19, and on 2 Corinthians 5:17 (note).

For in Christ Jesus - In his religion; see the note at Galatians 5:6.

But a new creature - The fact that a man is created anew, or born again, constitutes the real difference between him and other people. This is what Christ requires; this is the distinction which he designs to make. It is not by conformity to certain rites and customs that a man is to be accepted; it is not by elevated rank, or by wealth, or beauty, or blood; it is not by the color of the complexion; but the grand inquiry is, whether a man is born again, and is in fact a new creature in Christ Jesus; see the note at 2 Corinthians 5:17, for an explanation of the phrase "a new creature."

6:15 For neither circumcision is anything, nor uncircumcision - Neither of these is of any account. But a new creation - Whereby all things in us become new.