What is heart circumcision?
Heart circumcision is the spiritual cutting off of the old Adam at salvation, a work of the Spirit in the heart rather than an outward, literal cutting in the flesh. It is not the letter of the Law, and its praise is not of men but of God.
Les explains that circumcision cuts off what is superfluous in the flesh. In the Spirit, what is superfluous is the old Adam. At salvation, the old Adam is cut off, and it becomes a heart circumcision. This circumcision is of the heart in the Spirit, not in the letter, not merely keeping the Law, and its praise is not of men but of God.