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None should take upon them to be teachers of others but those who have made a good improvement in spiritual knowledge themselves.

(M. Henry.)

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KJV: For when for the time ye ought to be teachers, ye 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 strong meat.

WEB: For although by this time you should be teachers, you again need to have someone teach you the rudiments of the first principles of the oracles of God. You have come to need milk, and not solid food.