Hebrews 5:12; Hebrews 13:21-22
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.
Make you perfect in every good work to do his will, working in you that which is wellpleasing in his sight, through Jesus Christ; to whom be glory for ever and ever. Amen.
And I beseech you, brethren, suffer the word of exhortation: for I have written a letter unto you in few words.