I think that this quote nicely sums up the Grammar stage of learning...

"What that material is, is only of secondary importance; but it is as well that anything and everything which can be usefully committed to memory should be memorized at this period, whether it is immediately intelligible or not. The modern tendency is to try and force rational explanations on a child's mind at too early an age. Intelligent questions, spontaneously asked, should, of course, receive an immediate and rational answer; but it is a great mistake to suppose that a child cannot readily enjoy and remember things that are beyond his power to analyze--particularly if those things have a strong imaginative appeal (as, for example, "Kubla Kahn"), an attractive jingle (like some of the memory-rhymes for Latin genders), or an abundance of rich, resounding polysyllables (like the Quicunque vult)."

A quote from Dorothy Sayers' The Lost Tools of Learning ...