Hebrews 5:9-11

And having been made perfect [uniquely equipped and prepared as Savior and retaining His integrity amid opposition], He became the source of eternal salvation [an eternal inheritance] to all those who obey Him, [Is 45:17] being designated by God as High Priest according to the order of Melchizedek. [Ps 110:4] Concerning this we have much to say, and it is hard to explain, since you have become dull and sluggish in [your spiritual] hearing and disinclined to listen.