God has never left Himself without witness on the earth. At one time Melchisedek represented the Lord Jesus Christ in person, to reveal the truth of heaven, and perpetuate the law of God.
It was Christ that spoke through Melchisedek, the priest of the most high God. Melchisedek was not Christ, but he was the voice of God in the world, the representative of the Father. And all through the generations of the past, Christ has spoken; Christ has led His people, and has been the light of the world. When God chose Abraham as a representative of His truth, He took him out of his country, and away from his kindred, and set him apart. He desired to mold him after His own model. He desired to teach him according to His own plan.