Read Hebrews 7:23-28
7:23 Furthermore, the former priests were many in number, because they were prevented by death from continuing in office;
7:24 but he holds his priesthood permanently, because he continues forever.
7:25 Consequently he is able for all time to save those who approach God through him, since he always lives to make intercession for them.
7:26 For it was fitting that we should have such a high priest, holy, blameless, undefiled, separated from sinners, and exalted above the heavens.
7:27 Unlike the other high priests, he has no need to offer sacrifices day after day, first for his own sins, and then for those of the people; this he did once for all when he offered himself.
7:28 For the law appoints as high priests those who are subject to weakness, but the word of the oath, which came later than the law, appoints a Son who has been made perfect forever.
The letter to the Hebrews testifies to Jesus power to make us 'perfect' - this perfection is a transformation of all that is corrupt in our being towards being more like Jesus. Jesus is able to transform those who trust in him because he is more than just a human priest - but God himself who has offered himself as a living sacrifice to bring about change in people's lives.
Lord help me to trust in the power of your ministry in me. Transform me day by day.