Milk and meat (Hebrews 5:11-6:3)

Here is the relatively famous concept of milk and meat (NIV, "solid food").

The author tells the readers that they should be teachers, not needing basic teachings themselves.  By analogy to food, they should be mature enough to eat solid food, not milk.

I have heard the phrase "milk and meat" a lot.  From my observation, it comes in the context of people either belittling the spiritual maturity of others and saying "they" (other people) need milk, not meat.  To some extent, this is understandable since this is the pattern the author of Hebrews sets.

The other context is a person belittling the instruction that they are getting.  In essence, they say "what you are feeding me is milk, when I want meat".

What does the author say about it?

Maturity comes from using discerning between good and evil.  In fact, it comes from 'constant use' of it.  (5:14).  This allows someone to be mature enough for meat.  Can anyone really say we have used it "constantly".  No.  Likewise, the manner in which these judgments are made or expressed can show a lack of the precise maturity that is required.