St. John speaks of knowing Christ and of keeping His commandments, as the two great departments of religious duty and blessedness. To know Christ is ... to discern the Father of all, as manifested through His Only-begotten Son Incarnate. In the natural world we have glimpses, frequent and startling, of His glorious Attributes; of His power, wisdom, and goodness; of His holiness, His fearful judgments, His long remembrance of evil, His long-suffering towards sinners, and His strange encompassing mercy at times when we least looked for it. But to us mortals, who live for a day, and see but an arm's length, such disclosures are like reflections of a prospect in a broken mirror; they do not enable us in any comfortable sense to know God.
They are such as faith may use indeed, but hardly enjoy. This then was one among the benefits of Christ's coming, that the Invisible God was then revealed in the form and history of man, revealed in those respects in which sinners most required to know Him, and nature spoke least distinctly, as a Holy yet Merciful Governor of His creatures. And thus the Gospels, which contain the memorials of this wonderful grace, are our principal treasures. They may be called the text of the Revelation; and the Epistles, especially St. Paul's, are as comments upon it, unfolding and illustrating it in its various parts, raising history into doctrine, ordinances into sacraments, detached words or actions into principles, and thus everywhere dutifully preaching His Person, work, and will. St. John is both Prophet and Evangelist, recording and commenting on the Ministry of his Lord. Still, in every case, He is the chief Prophet of the Church, and His Apostles do but explain His words and actions; according to His own account of the guidance promised to them, that it should "glorify" Him. The like service is ministered to Him by the Creeds and doctrinal expositions of the early Church, which we retain in our Services. They speak of no ideal being, such as the imagination alone contemplates, but of the very Son of God, whose life is recorded in the Gospels. Thus every part of the Dispensation tends to the manifestation of Him who is its centre.
Parochial & Plain Sermons, II, sermon 14.