By faith, when he grew up, Moses refused to be called the son of Pharaoh’s daughter,

As it says, ¹  “Oh, that today you would listen as he speaks! ²  Do not harden your hearts as in the rebellion.” ³ 

So if perfection had in fact been possible through the Levitical priesthood – for on that basis ¹  the people received the law – what further need would there have been for another priest to arise, said to be in the order of Melchizedek and not in Aaron’s order?