For when for the time you ought to be teachers, you have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of solid food.
All Commentaries on Hebrews 5:12 Go To Hebrews 5
Clement Of Alexandria
AD 215
But solid food belongs to those who are of full age, who by reason of use have their senses exercised so as to distinguish between good and evil. Wherefore, leaving the first principles of the doctrine of Christ, let us go on to perfection.".
Wherefore also, writing to the Hebrews, who were declining again from faith to the law, he says "Have ye not need again of one to teach you which are the first principles of the oracles of God, and are become such as have need of milk, and not of strong meat? "