But, Richard, we are also commanded to "grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ" (II Peter 3:18).
" 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.  For every one that useth milk is unskilful in the word of righteousness: for he is a babe." (Heb. 5)
I think this "Sunday School" may be for the advanced.