What this shows is that there is a way of grasping a rule which is not an interpretation, but which is exhibited in what we call "obeying the rule" and "going against it" in actual cases.[23]
So following a rule is a practice. And furthermore, since one can think one is following a rule and yet be mistaken, thinking one is following a rule is not the same as following it. Therefore, following a rule cannot be a private activity.[24]