Although by this time you ought to be teachers, you need someone to reteach you the basic principles of God’s word. You need milk, not solid food!
12. For when for the time ye ought, etc. This reproof contains in it very sharp goads to rouse the Jews from their sloth. He says that it was unreasonable and disgraceful that they should still continue in the elements, in the first rudiments of knowledge, while they ought to have been teachers.
Here the apostle returns to what he had in Heb 5:6 cited out of Psa 110:1-7, concerning the peculiar order of the priesthood of Christ, that is, the order of Melchisedec. And here, I. He declares he had many things which he could say to them concerning this mysterious person called Melchisedec, whose priesthood was eternal, and therefore the salvation procured thereby should be eternal also.
Commenting on Hebrews 5:10-14
For everyone that useth milk,.... And sits down contented with the first principles of the Gospel, such as are easily taken in and digested; or makes use of the ceremonial law, as a schoolmaster to teach him the Gospel: is unskilful in the word of righteousness; the Gospel, which is a doctrine of righteousness; not of works of righteousness done by men, and of justification...