Thus in the Epistle to the Colossians[10] the doctrine of the catholicity of Christianity is again vindicated controversially, and logically based upon the catholic character of Christ and upon His universal function in creation and redemption; and in the contemporary Epistle to the Ephesians, without note of controversy, the doctrine of the catholic church, the brotherhood of all men in Christ, the doctrine which is, we may truly say, the culmination of all St. Paul's teaching, is allowed to develope itself in all its glory on the assumed basis of that teaching about Christ's person which had made any narrower idea of the church already seem incongruous and impossible. In the earlier dispensation in which the covenant of God was with one people, St. Paul can see only a preparatory process through {15} which the eternal purpose of God could at last be realized, and out of which His eternal secret could at last be disclosed. That purpose so long kept secret, and now revealed, is to gather together all nations and classes of men into the one Church of God, one organized body, one brotherhood in which all men are to find their salvation, and through which is to be realized an even wider purpose for the whole universe. In this doctrine of the catholic church St. Paul finds the expression of all the length and breadth and height and depth of the divine love. Its length, for it represents an age-long purpose slowly worked out; its breadth, for it is a society of all men and for the whole universe; its depth, for God has reached a hand of mercy down to the lowest gulfs of sin and alienation from God; its height, for in this society men are carried up into nothing less than union with God, to no lower seat than the heavenly places in Christ.