With the significance of circumcision to other men who practise it, we have here nothing to do. It is as the chief sacrament of the old covenant, by which God meant to aid all succeeding generations of Hebrews in believing that God was their God. And this particular mark was given, rather than any other, that they might recognise and ever remember that human nature was unable to generate its own Saviour, that in man there is a native impurity which must be laid aside when he comes into fellowship with the Holy God. And these circumcised races, although in many respects as unspiritual as others, have yet in general perceived that God is different from nature, a Holy Being to Whom we cannot attain by any mere adherence to nature, but only by the aid He Himself extends to us in ways for which nature makes no provision. The lesson of circumcision is an old one and rudely expressed, but it is vital; and no abhorrence of the circumcised for the uncircumcised too strongly, however unjustly, emphasizes the distinction that actually subsists between those who believe in nature and those who believe in God. The lesson is old, but the circumcision of the heart to which the outward mark pointed, is ever required. That is the true seal of our fellowship with God; the earnest of the Spirit which gives promise of eternal union with the Holy One; the relentings, the shame, the softening of heart, the adoration and reverence for the holiness of God, the thirst for Him, the joy in His goodness, these are the first fruits of the Spirit, which lead on to our calling God Father, and feeling that to be alone with Him is our happiness. It is this putting aside of our natural confidence in nature and absorption in nature, and this turning to God as our confidence and our life, which constitutes the true circumcision of the heart.