“So the previous command is annulled because it was weak and unprofitable (for the law perfected nothing), but a better hope is introduced, through which we draw near to God” (Heb. 7:18-19).
“For the law appoints as high priests men who are weak, but the word of the oath, which came after the law, a Son (having been perfected) into the ages” (Heb. 7:28).
By oath, God appointed a Son into the ages, who had been perfected. The Son can be appointed into the ages *because* He was perfected. As the source of salvation, Jesus is perfect, complete, lacking nothing. This echos chapters two and five where we have already been told Jesus was perfected or made complete as the source of salvation.
Jesus is complete or perfect because He is the Son. As Son of Man, He shared our flesh and blood, He could die, He was tempted and suffered, He sympathizes with our weaknesses, He shed the blood needed for forgiveness (Heb. 2:14; 4:15; 9:22). As Son of God, He “has passed through the heavens”, He entered the true sanctuary as our anchor, He is holy and undefiled (Heb. 4:14; 6:20; 7:26; 9:12). Who better to represent God and man to each other than the God-man? As a representative, He can offer everything needed by either party. He is perfect and complete. Because of this, the Son has been appointed to the ages.
The law perfected nothing. The Son *is* perfect. Perfection is something the law required. Perfection is something the Son is. The law fell short of perfection, even after ages. The Son is perfect into the ages.
We can strive to perfect ourselves and relate to God through the law as long as we want; we will never reach perfection. But if the Son is born in our hearts as a gift, He is the perfection we can never reach. In reality, God has only ever wanted His Son. Reaching perfection through obeying the law wouldn’t make me the Son; I would still fall short of the Father’s desire. But if the Son lives within, the Father’s heart is full and pleased.
The Son is our High Priest because He offered sacrifice for everyone on the cross. He is High Priest because He offered His own blood in the sanctuary that isn’t part of this creation (Heb. 9:11). The Son is High Priest because “He always lives to intercede” for us (Heb. 7:25). The Son is also our High Priest because He lives within and it is through Christ within that we approach and relate to God.