“God… hath in these last days spoken unto us by His Son.” Jesus is set in juxtaposition with the fathers and prophets that have gone before. The purpose that God had for these men in the past was to communicate truth to His people, namely His will for them, and through this to reveal something of Himself to them. Though Christ has been set apart for a similar task, He has been lifted up in a manner that is far superior to these men. All of what has been said before has led up to this One and is fulfilled by this One. It is completed. There is a finality in the mood of this text evinced by the word “in these last days.” They are the last days because there is no more need for more prophets to be risen up, we have received the perfect One. God has spoken for the last time through His Son, and the Apostles, with the Spirit of Christ, testify of what was already revealed.
Christ is a far worthier speaker and revealer of the Father because this One is far more qualified to do so. He is made much better than the angels who are, compared to men, much wiser, purer, and powerful. Then how much weightier are His words if He is greater than what is greater than men? He is the heir of all things and sits at the right hand of the Father- so we are all under His authority, none can surpass it, not even Moses, and all things are done for the good of His redemptive, sin-purifying interests. So, how much more should we bend our ears to listen to His words, knowing His authority? He is the creator of the world- not as an instrument, but by Him because in Him is all the eternal wisdom of God and power, through His word, to form, order, and uphold the world. How much more, then, should we trust His word knowing its efficacy? And Christ is the brightness of His glory, and the express image of His person- there is no greater way to make God known than by the One who is His express or exact image and impression, He cannot but reveal the Father. But more, there is no other way than by Christ, for all knowledge and revelation must beam and radiate through Christ for it to be a true reflection of God. So, what other way is there for us to comprehend the Incomprehensible if not through the only true image, His Son?
There can be no other revealer after this. And we ought not look for another. None can be greater than this.