Matthew 17:5

The bright cloud overshadowing the Saints is the Power of the Father, or perhaps the Holy Spirit; or I may also venture to call the Saviour that bright cloud which overshadows the Gospel, the Law, and the Prophets, as they understand who can behold His light in all these three. The voice out of the cloud speaks either to Moses or Elias, who desired to see the Son of God, and to hear Him; or it is for the teaching of the Apostles.

This is the Son, this the Beloved, this the Accepted; and He it is who is to be heard, as the voice out of the cloud signifies, saying, Hear ye Him. For He is a fit teacher of doing the things He has done, who has given the weight of His own example to the loss of the world, the joy of the cross, the death of the body, and after that the glory of the heavenly kingdom.

What then? He Himself speaks nothing, nor Moses, nor Elias, but He that is greater than all, and more worthy of belief, the Father, uttereth a voice out of the cloud. Wherefore out of the cloud? Thus doth God ever appear. "For a cloud and darkness are round about Him;" and, "He sitteth on a light cloud;" and again, "Who maketh clouds His chariot;" and, "A cloud received Him out of their sight;" and, "As the Son of Man coming in the clouds." In order then that they might believe that the voice proceeds from God, it comes from thence. And the cloud was bright. For "while he yet spake, behold, a bright cloud overshadowed them; and, behold, a voice out of the cloud, which said, This is My beloved Son, in whom I am well pleased; hear ye Him." For as, when He threatens, He shows a dark cloud; as on Mount Sinai; for "Moses," it is said, "entered into the cloud, and into the thick darkness; and as a vapor, so went up the smoke;" and the prophet said, when speaking of His threatening, "Dark water in clouds of the air;" so here, because it was His desire not to alarm, but to teach, it is a bright cloud. And whereas Peter had said "Let us make three tabernacles," He showed a tabernacle not made with hands. Wherefore in that case it was smoke, and vapor of a furnace; but in this, light unspeakable and a voice. Then, to signify that not merely concerning some one of the three was it spoken, but concerning Christ only; when the voice was uttered, they were taken away. For by no means, had it been spoken merely concerning any one of them, would this man have remained alone, the two being severed from Him. Why then did not the cloud likewise receive Christ alone, but all of them together? If it had received Christ alone, He would have been thought to have Himself uttered the voice. Wherefore also the evangelist, making sure this same point, saith, that the voice was from the cloud, that is, from God. And what saith the voice? "This is my beloved Son." Now if He is beloved, fear not thou, O Peter. For thou oughtest indeed to know His power already, and to be fully assured touching His resurrection; but since thou knowest not, at least from the voice of the Father take courage. For if God be mighty, as surely He is mighty, very evidently the Son is so likewise. Be not afraid then of those fearful things. But if as yet thou receive it not, consider at least that other fact, that He is both a Son, and is beloved. For "This," it is said, "is My beloved Son." Now if He is beloved, fear not. For no one gives up one whom he loves. Be not thou therefore confounded; though thou lovest Him beyond measure, thou lovest Him not as much as He that begat Him. "In whom I am well pleased." For not because He begat Him only, doth He love Him, but because He is also equal to Him in all respects, and of one mind with Him. So that the charm of love is twofold, or rather even threefold, because He is the Son, because He is beloved, because in Him He is well pleased. But what means, "In whom I am well pleased?" As though He had said, "In whom I am refreshed, in whom I take delight;" because He is in all respects perfectly equal with Himself, and there is but one will in Him and in the Father, and though He continue a Son, He is in all respects one with the Father. "Hear ye Him." So that although He choose to be crucified, you are not to oppose Him.

While they thought only of an earthly tabernacle of boughs or tents, they are overshadowed by the covering of a bright cloud; While he yet spake, there came a bright cloud and overshadowed them. (Exod. 19:9, 16.) Forasmuch as Peter had asked unwisely, he deserves not any answer; but the Father makes answer for the Son, that the Lord's word might be fulfilled, He that sent me, he beareth witness of me. (John 5:37.) The voice of the Father is heard speaking from heaven, giving testimony to the Son, and teaching Peter the truth, taking away his error, and through Peter the other disciples also; whence he proceeds, This is my beloved Son. For Him make the tabernacle, Him obey; this is the Son, they are but servants; and they also ought as you to make ready a tabernacle for the Lord in the inmost parts of their heart.

He says therefore, Hear ye Him, as much as to say, Let the shadow of the Law be past, and the types of the Prophets, and follow ye the one shining light of the Gospel. Or He says, Hear ye Him, to show that it was He whom Moses had foretold, The Lord your God shall raise up a Prophet unto you of your brethren like unto me, Him shall ye hear. (Deut. 18:18.) Thus the Lord had witnesses on all sides; from heaven the voice of the Father, Elias out of Paradise, Moses out of Hades, the Apostles from among men, that at the name of Jesus every thing should bow the knee, of things in heaven, things on earth, and things beneath.