The Christian Life: Union with Christ — Charles Hodge
As Christ is our spiritual Head, eternal life which is in him, descends to all his members. It is not they that live, but Christ that liveth in them (Gal. 2.20). This doctrine of the representative and vital union of Christ and believers pervades the New Testament. It is the source of the humility, the joy, the confidence which the sacred writers so often express. In themselves they were nothing, and deserved nothing, but in Him they possessed all things. Hence, they counted all things but loss that they might be found in Him. Hence, they determined to know nothing, to preach nothing, to glory in nothing, but Christ and him crucified.
— Charles Hodge, The Way of Life, 1841