Now, innumerable as are the particulars in which the Christian revelation consists, they may yet be gathered up mainly into two points, which meet in the Person of our Lord, and are termed by the ancient fathers who have followed this division, the _Theology_, and the _Economy_. There is the Divine Nature, that "_form of God_," which our Lord had from the beginning in the bosom of the Father; and there is the human nature, that "_form of a servant_," which "in the economy or dispensation of the fulness of times" He assumed, in order that He might purchase the Church with His blood, and[2] "re-establish all things in heaven and on earth." All, therefore, in the Christian faith which concerns "the form of God" is termed the Theology; all which contemplates "_the form of a servant_," the Economy. But the heavenly origin and certain truth of both these parts of Christian faith are proved partly by the fulfilment of prophecy, and partly by the working of miracles. To both our Lord perpetually appealed, and His apostles after Him, and those who have followed them. One, then, who was to be the chief ruler and doctor of Christians, needed especial instruction in the Theology, and Economy, especial assurance of the fulfilment of prophecy, and the working of miraculous power. Now Peter was specially selected for this instruction and that assurance. The whole teaching of our Lord, indeed, and the innumerable acts of power and words of grace with which it was fraught, were calculated to convey these to all the Apostles. But while they were witnesses in common of that teaching in general, some parts of it were disclosed only to Peter and the two sons of Zebedy. Perhaps there is no incident in the Gospel history, which set forth in so lively a manner, and so convincingly proved, the mysteries concerning the union of "the form of God" and "the form of a servant," as the Transfiguration. The retreat to the "high mountain apart," and in the midst of that solitary prayer, "the face shining as the sun," and "the robes white as light," the presence of Moses and Elias, conversing with Him on the great sacrifice for sin, "the bright cloud which encompassed them," and the voice from out of it, proclaiming "This is my beloved Son, in whom I am well pleased: hear Him;" so impressed themselves on the great Apostle, that after long years he appealed to them in proof that he and his brethren had not taught "cunningly devised fables, when they made known the power and presence of the Lord Jesus Christ, but had been eyewitnesses of His majesty, when He received from God the Father honour and glory, this voice coming down to Him from the excellent glory, 'This is my beloved Son, in whom I have pleased myself: hear ye Him.' And this voice we heard brought from heaven, when we were with Him in the holy mount." Among all the Apostle's experience of the three years' ministry, by the shore and on the waves of the lake of Galilee, in