It is the gospel that exhibits God's highest glory, which he chiefly designs to display before sinful men, even that glory of God that shineth in the face of Christ. It is the gospel that sets forth the glory of Christ, and by which the Holy Spirit himself is glorified; and it is it that will be honoured with the concomitant (accompanying) influence of the Holy Spirit...
If it should now be asked what is that special doctrine of the gospel, and, strictly speaking, the doctrine of faith? I shall answer briefly -
All revealed truth ought to be greatly valued, and received by faith, and, if properly used, may be subservient to the main subject and design of the gospel. But the special subject of the gospel is Christ; and preaching Christ, according to the light and direction of the Word of God, is preaching the gospel... To preach Christ the Savior and the Lord, is the sum of gospel-preaching.
- James Fraser, A Treatise on Sanctification (1774)
HT: The Discipline of Grace