Hebrews 7: Perfection
If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchisedec, and not be called after the order of Aaron? (verse 11)
If perfection can be achieved by the law through men bound by their own mortality, then grace through Christ will bring utter perfection to those who believe.