Verse 19. Circumcision is nothing, etc. It is of no consequence in itself. It is not that which God requires now. And the mere external rite can be of no consequence one way or the other. The heart is all; and that is what God demands. See Barnes "Ro 2:29".

But the keeping of the commandments of God. Is something, is the main thing, is everything; and this can be done whether a man is circumcised or not.

{a} "Circumcision" Ga 5:6; 6:15 {b} "keeping" Joh 15:14