Matthew Poole and continuators on Hebrews 5:11

The Spirit here digresseth from discoursing further of the Priesthood of Christ, that he may fit these Hebrews to apprehend and improve it when he shall return to it, ch. 7. He beginneth with a Reproof, which takes up the remainder of the Chapter, aed enters on it artificially from the Doctrine delivered of Christ's Priesthood, insinuating the Difficulty of its Reception by them: [non-Latin text not transcribed] of whom, some would make to refer to Melchisedeck, but by what followeth in this and ch. 7. it can be spoken of none but of Christ the Truth of that Type, who was made an High-Priest after that order. And of him the Apostle was filled by the Spirit with matter, as Elihu speaks, Iob 32.18. Much he had to say of this Mystery, which was most excellent and weighty, and which a few words could not express; for it was [non-Latin text not transcribed], not unutterable in it self, or difficult for him to open and interpret, but for them to understand.

Because the Ears of their Mind were not created nor proportioned to it: they were Babes and Children in Understanding; the difficulty was in themselves, not in the Word or Mystery: Their intellective Faculty was slow to discern, perceive, and judge of this Doctrine, and their Hearts were averse to it, being so conceited concerning the Levitical Priesthood; such were the Apostles at the first, Iohn 16.12.