We struggle to reach any degree of fluency because there is so much to remember. The rulebook of the language game is too long. We go to classes that discuss the rulebook, we run drills about one rule or another, but we never get to play the game. On the off chance that we ever reach the end of a rulebook, we’ve forgotten most of the beginning already. Moreover, we’ve ignored the other book (the vocabulary book), full of thousands upon thousands of words that are just as hard to remember as the rules.