The grammar metaphor can be extended: Learning can be thought of as
the acquisition of language (not the words you use to speak, but the
concepts you use to understand and think things). As you learn you are
exposed to concepts which expand your ability to understand the world
around you, to distinguish between things and categorize. Your
grammar, your personal language, is a measure of your ability to
understand things you apprehend in the world. The greater the expanse
of your personal language the more you can understand. The more you
understand, the greater your ability to flexibly interact with the
challenges that face you. Not just now, but in the future as well:
a flexible grammar can adapt and reshape itself. A flexible grammar
also feeds itself: learning new things is easier because there is more
to compare with.