Mark 9:4

Or else it means, that we are to see in glory both the Law and the Prophets speaking with Him, that is, we shall then find that all those things which were spoken of Him by Moses and the other prophets agree with the reality; then too we shall hear the voice of the Father, revealing to us the Son of the Father, and saying, This is my beloved Son, and the cloud, that is, the Holy Ghost, the fount of truth, will overshadow us.

And there appeared unto them Elias with Moses,.... Or Moses and Elias, as all the Oriental versions read, as in Mat . 17:3; see Gill on Mat 17:3, and they were talking with Jesus; concerning his decease, and what he was to do and suffer at Jerusalem, and of which he himself had lately talked with his disciples; so that this might have been a confirmation of these things to them; See Gill on Mat 17:3.

Moses and Elias lived at a great distance of time one from another, but that breaks no squares in heaven, where the first shall be last, and the last first, that is, all one in Christ. The great delight that the disciples took in seeing this sight, and hearing this discourse, is expressed by Peter, the mouth of the rest; He said, Master, it is good for us to be here,

The connection of this passage with the end of the last chapter ought never to be overlooked. Our Lord had been speaking of His own coming death and passion — of the necessity of self-denial, if men would be His disciples — of the need of losing our lives, if we would have them saved. But in the same breath he goes on to speak of His future kingdom and glory. He takes off the edge of His "hard sayings," by promising a sight of that glory to some of those who heard Him.

The connection of this passage with the end of the last chapter ought never to be overlooked. Our Lord had been speaking of His own coming death and passion — of the necessity of self-denial, if men would be His disciples — of the need of losing our lives, if we would have them saved. But in the same breath he goes on to speak of His future kingdom and glory. He takes off the edge of His "hard sayings," by promising a sight of that glory to some of those who heard Him. And in the history of the transfiguration, which is here recorded, we see that promise fulfilled. The first thing which demands our notice in these verses, is the marvelous vision they contain of the glory which Christ and His people shall have at His second coming . There can be no doubt that this was one of the principal purposes of the transfiguration. It was meant to teach the disciples, that though their Lord was lowly and poor in appearance now, He would one day appear in such royal majesty as became the Son of God. It was meant to teach those who when their Master came the second time, His saints, like Moses and Elijah, would appear with Him. It was meant to remind them, that though reviled and persecuted now, because they belonged to Christ, they would one day be clothed with honor, and be partakers of their Master's glory. We have reason to thank God for this vision. We are often tempted to give up Christ's service, because of the cross and affliction which it entails. We see few with us, and many against us. We find our names cast out as evil, and all manner of evil said of us, because we believe and love the Gospel. Year after year we see our companions in Christ's service removed by death, and we feel as if we knew little about them, except that they are gone to an unknown world, and that we are left alone. All these things are trying to flesh and blood.